"Install dependencies" step of GitHub Action fails

cooljeanius/explore#21 is currently failing due to:
```
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/gems/3.2.0/gems/yajl-ruby-1.1.0/ext/yajl
/opt/hostedtoolcache/Ruby/3.2.2/x64/bin/ruby extconf.rb
creating Makefile

current directory:
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/gems/3.2.0/gems/yajl-ruby-1.1.0/ext/yajl
make DESTDIR\= sitearchdir\=./.gem.20240808-3144-qr1e12
sitelibdir\=./.gem.20240808-3144-qr1e12 clean

current directory:
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/gems/3.2.0/gems/yajl-ruby-1.1.0/ext/yajl
make DESTDIR\= sitearchdir\=./.gem.20240808-3144-qr1e12
sitelibdir\=./.gem.20240808-3144-qr1e12
compiling yajl.c
compiling yajl_alloc.c
compiling yajl_buf.c
compiling yajl_encode.c
compiling yajl_ext.c
yajl_ext.c: In function ‘yajl_encode_part’:
yajl_ext.c:117:21: warning: variable ‘status’ set but not used
[-Wunused-but-set-variable]
117 | yajl_gen_status status;
| ^~~~~~
yajl_ext.c: In function ‘rb_yajl_parser_parse’:
yajl_ext.c:442:17: warning: variable ‘stat’ set but not used
[-Wunused-but-set-variable]
442 | yajl_status stat;
| ^~~~
In file included from
/opt/hostedtoolcache/Ruby/3.2.2/x64/include/ruby-3.2.0/ruby/ruby.h:27,
from
/opt/hostedtoolcache/Ruby/3.2.2/x64/include/ruby-3.2.0/ruby.h:38,
from yajl_ext.h:32,
from yajl_ext.c:24:
yajl_ext.c: In function ‘rb_yajl_encoder_enable_json_gem_ext’:
yajl_ext.c:852:22: error: ‘rb_cFixnum’ undeclared (first use in this function);
did you mean ‘rb_cFile’?
852 | rb_define_method(rb_cFixnum, "to_json",
rb_yajl_json_ext_fixnum_to_json, -1);
| ^~~~~~~~~~
/opt/hostedtoolcache/Ruby/3.2.2/x64/include/ruby-3.2.0/ruby/internal/anyargs.h:288:120:
note: in definition of macro ‘rb_define_method’
288 | #define rb_define_method(klass, mid, func, arity)
RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid),
(func), (arity))
|
^~~~~
yajl_ext.c:852:22: note: each undeclared identifier is reported only once for
each function it appears in
852 | rb_define_method(rb_cFixnum, "to_json",
rb_yajl_json_ext_fixnum_to_json, -1);
| ^~~~~~~~~~
/opt/hostedtoolcache/Ruby/3.2.2/x64/include/ruby-3.2.0/ruby/internal/anyargs.h:288:120:
note: in definition of macro ‘rb_define_method’
288 | #define rb_define_method(klass, mid, func, arity)
RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid),
(func), (arity))
|
^~~~~
yajl_ext.c: In function ‘Init_yajl’:
yajl_ext.c:863:6: warning: old-style function definition
[-Wold-style-definition]
863 | void Init_yajl() {
| ^~~~~~~~~
yajl_ext.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been
intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have
been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may
have been intended to silence earlier diagnostics
make: *** [Makefile:248: yajl_ext.o] Error 1

make failed, exit code 2

Gem files will remain installed in
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/gems/3.2.0/gems/yajl-ruby-1.1.0 for
inspection.
Results logged to
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/gems/3.2.0/extensions/x86_64-linux/3.2.0/yajl-ruby-1.1.0/gem_make.out

/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:119:in
`run'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:51:in
`block in make'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:43:in
`each'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:43:in
`make'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/ext_conf_builder.rb:41:in
`build'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:187:in
`build_extension'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:221:in
`block in build_extensions'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:218:in
`each'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/ext/builder.rb:218:in
`build_extensions'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/rubygems/installer.rb:843:in
`build_extensions'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/rubygems_gem_installer.rb:72:in
`build_extensions'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/rubygems_gem_installer.rb:28:in
`install'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/source/rubygems.rb:200:in
`install'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/installer/gem_installer.rb:54:in
`install'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/installer/gem_installer.rb:16:in
`install_from_spec'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/installer/parallel_installer.rb:156:in
`do_install'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/installer/parallel_installer.rb:147:in
`block in worker_pool'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/worker.rb:62:in
`apply_func'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/worker.rb:57:in
`block in process_queue'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/worker.rb:54:in
`loop'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/worker.rb:54:in
`process_queue'
/opt/hostedtoolcache/Ruby/3.2.2/x64/lib/ruby/3.2.0/bundler/worker.rb:90:in
`block (2 levels) in create_threads'

An error occurred while installing yajl-ruby (1.1.0), and Bundler cannot
continue.

In Gemfile:
github-pages was resolved to 28, which depends on
jekyll-mentions was resolved to 0.1.3, which depends on
jekyll was resolved to 2.4.0, which depends on
pygments.rb was resolved to 0.6.0, which depends on
yajl-ruby
Error: Process completed with exit code 5.
```
I think this is due to either brianmario/yajl-ruby#116 and/or brianmario/yajl-ruby#164 (not quite sure which)...

Start with the GitHub Actions “Install dependencies” step and the Gemfile dependency chain shown in the report, especially github-pages → jekyll → pygments.rb → yajl-ruby. Reproduce the failure under Ruby 3.2 and verify that dependency installation completes successfully in the action.

Written by the indexing model from the issue text.