Fix
* fix(gh-actions-output): fixed trailing newline to match GITHUB_OUTPUT format (885)
* test(gh-actions-output): fix unit tests to manage proper whitespace
tests were adjusted for clarity and to replicate error detailed in 884.
* fix(gh-actions-output): fixed trailing newline to match GITHUB_OUTPUT format
Resolves: 884 ([`2c7b6ec`](https://github.com/python-semantic-release/python-semantic-release/commit/2c7b6ec85b6e3182463d7b695ee48e9669a25b3b))