* feat: handle multiple commits in a single message

- updated `splitMessages` function to handle multiple conventional commits within the main message
- added logic to separate conventional commits (feat, fix, docs, etc.) within the main message
- preserved the original message structure outside of nested commit blocks
- enhanced breaking change detection from commit body in `toConventionalChangelogFormat` and `postProcessCommits` functions

Resolves #2357

* test: new test case for parsing multiple commits

- added new test cases for parsing multiple commits from a single message
- added fixture file for multiple commits in a single message
- changed the order of the expected commits in `multiple-messages` and `1257-breaking-change` fixtures since the order of the commits in the is not reversed anymore

* test: remove duplicate test for parsing multiple commits

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

…ewlines (#2390)

* fix: when parsing multiple messages from a single commit, require 2 newlines

* test: fix test name

* try optional windows newlines

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* fix merging behaviour in plugin

* add test

* remove unused test snapshot

* update licnese header

* considering plugin schema carefully

* add unit test

* remove `determineMerge` and set default value directly

* set default value for `separatePullRequests` in `buildPlugin`

---------

Co-authored-by: Jeff Ching <chingor@google.com>

* fix: match full artifact id when updating versions

* add unit tests

* lint

* fix unit test

* lint

* restore package

* restore package

* add unit test

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Bumps [jsonpath-plus](https://github.com/s3u/JSONPath) from 9.0.0 to 10.0.0.
- [Release notes](https://github.com/s3u/JSONPath/releases)
- [Changelog](https://github.com/JSONPath-Plus/JSONPath/blob/main/CHANGES.md)
- [Commits](https://github.com/s3u/JSONPath/commits)

---
updated-dependencies:
- dependency-name: jsonpath-plus
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* feat: add "always-update" config option

Fixes #1459

This patch adds a new option "always-update" that forces existing pull
requests to be updated even when there are no changes to the
release notes. This is useful, for example, when the repository
enforces pull requests to be up-to-date with the main branch before
they can be merged. Without this option set to `true`, that is, with the
default behavior of release-please, if the last commit made to the
main branch does not appear in the release notes, the existing pull
request branch would not be rebased.

* feat: apply suggested changes

---------

Co-authored-by: Fabian Meyer <3982806+meyfa@users.noreply.github.com>
Co-authored-by: Jeff Ching <chingor@google.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>