zsh: /usr/local/bin/colorls: bad interpreter: /usr/bin/ruby2.5: no such file or directory

### Description

After I installing (`gem install colorls`) it gives me the following error:
`zsh: /usr/local/bin/colorls: bad interpreter: /usr/bin/ruby2.5: no such file or directory`

doing `cat /usr/local/bin/colorls` shows `#!/usr/bin/ruby2.5` but `ruby -v` shows that I have ruby 3, not 2.5: `ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux-gnu]`

Linux Mint 21.1.
`gem --version` `3.3.5`

- Relevant Issues : (none)
- Relevant PRs : (none)
- Type of issue :
- [x] Installation
- [ ] Font-related
- [ ] Feature request
- [ ] Bug in existing feature
- [ ] Developer mode : Code quality / Tests / Documentation

Reproduce the installation with `gem install colorls` and inspect `/usr/local/bin/colorls` and its `#!/usr/bin/ruby2.5` line. Trace how the gem's executable is generated during installation; done means a current Ruby installation can invoke `colorls` without a missing-interpreter error.

Written by the indexing model from the issue text.