release_handler issue

### Steps to reproduce

Running a deployment with Edeliver. Just updated to erlang OTP 25. Tried to build the release and it breaks.

### Verbose Logs

MIX_ENV=prod env MIX_ENV=prod mix edeliver build release --branch=master --verbose

```
==> Generating RELEASES
==> Release failed: no match of right hand side value: {:error, :eacces}
(distillery 2.1.1) lib/distillery/releases/assembler.ex:863: Distillery.Releases.Assembler.create_RELEASES/2
(distillery 2.1.1) lib/distillery/releases/assembler.ex:290: Distillery.Releases.Assembler.write_release_scripts/1
(distillery 2.1.1) lib/distillery/releases/assembler.ex:50: Distillery.Releases.Assembler.assemble/1
(distillery 2.1.1) lib/distillery/tasks/release.ex:130: Mix.Tasks.Distillery.Release.do_release/2
(mix 1.13.0) lib/mix/task.ex:397: anonymous fn/3 in Mix.Task.run_task/3
(mix 1.13.0) lib/mix/cli.ex:84: Mix.CLI.run_task/2
(elixir 1.13.0) src/elixir_compiler.erl:73: :elixir_compiler.dispatch/4
(elixir 1.13.0) src/elixir_compiler.erl:58: :elixir_compiler.compile/3

A remote command failed on:

ubuntu@placeholder.com

Output of the command is shown above and the command executed
on that host is printed below for debugging purposes:

FAILED with exit status 1:

[ -f ~/.profile ] && source ~/.profile
set -e
cd /home/ubuntu/app/mysite.com/myApp_builds
if [ "mix" = "rebar" ]; then
echo "using rebar to generate release"
./rebar -f generate
elif [ "mix" = "relx" ]; then
echo "using relx to generate release"
./relx release
elif [ "mix" = "mix" ]; then
echo "using mix to generate release"
MIX_ENV="prod" LINK_SYS_CONFIG="" LINK_VM_ARGS="" APP="myApp" AUTO_VERSION="" BRANCH="master" SKIP_RELUP_MODIFICATIONS="" RELUP_MODIFICATION_MODULE="" USING_DISTILLERY="true" mix distillery.release --verbose --env="prod" --name="myApp"
fi
```

### Description of issue

- What are the expected results? It's expected to build the release but I believe the recent update to erlang broke :release_handler .
- What version of Distillery? 2.1
- What OS, Erlang/Elixir versions are you seeing this issue on? ubuntu, 25, 13.3.3
- If possible, also provide your `rel/config.exs' : Will do if necessary but it contains some sensitive information. Will hence require editing.
- Is there documentation that says one thing, but Distillery does
another? https://www.erlang.org/blog/my-otp-25-highlights/ I think the change to the release handler on this page is the problem.

Thanks in advance!