fix(commit): trim the trailing newline from message

[vbx]

When the commit message ends with a '\n', then it is not considered a valid conventional commit. That's why the message must be cleaned up.

Description and Motivation and Context

Wrong next version when using the bumped-version parameter. The 'git commit' command creates a '\n' at the end of the line.
In this case, commit is considered as a patch.
https://github.com/MarcoIeni/release-plz/blob/4b0684ff8d9048032167a43fd70b70af4940239d/crates/next_version/src/next_version.rs#L27

    /// - If some commits are present, but none of them match conventional commits specification,
    ///   the version is incremented as a Patch.

How Has This Been Tested?

git cli command on linux/macos

Screenshots / Logs (if applicable)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[orhun]

Hey, thanks for the PR! 🐻

Do you think this might have side effects? It should be backwards compatible I reckon.

Also, looks like the formatting job has failed, can you run cargo fmt?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2c524b8) 42.90% compared to head (8084d09) 42.90%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
=======================================
  Coverage   42.90%   42.90%           
=======================================
  Files          13       13           
  Lines         690      690           
=======================================
  Hits          296      296           
  Misses        394      394           

Flag	Coverage Δ
unit-tests	42.90% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[vbx]

no side effects, i think. 'cargo fmt' is ok. i rebased branch also. PR is up to date.

[orhun]

Thanks!

[welcome]

Congrats on merging your first pull request! ⛰️

[nachtien]

nice work!