Support symbols in changelog message subcategory

[aduth]

🛠 Summary of changes

Updates changelog script to support use of more symbols in subcategories. Previously, this was limited to \w - (most alphanumeric, underscore, dash, and spaces). The current logic allows for everything other than commas.

Related Slack conversation: https://gsa-tts.slack.com/archives/C05MGJ72GU9/p1701709507202099

📜 Testing Plan

The commit of this pull request is self-verifying, so observe that build passes.

[jmdembe]

This change looks great! What do you think about adding a note about allowed characters in the CHANGELOG file?

[aduth]

What do you think about adding a note about allowed characters in the CHANGELOG file?

Do you mean being clearer about which characters are supported within the changelog of this pull request? Or some other documentation?

[jmdembe]

What do you think about adding a note about allowed characters in the CHANGELOG file?

Do you mean being clearer about which characters are supported within the changelog of this pull request? Or some other documentation?

I was thinking about being clearer in the CONTRIBUTING.md document, specifically under pull requests.

[aduth]

Gotcha. My hope is generally that we should want to support anything, though I suppose it could be a little clearer that it can't contain a comma (at least as of now). I'll update.

[aduth]

Updated CONTRIBUTING.md guidance in 6513471