git-town 12.1.0

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

Git Town 12.1 implements some of the most requested features by the Git Town community. It also continues the modernization of Git Town's internals. This time we made Git Town's undo engine simpler, more robust, and more reliable by removing all remaining mutable state.
New Features

New options to fine-tune how Git Town syncs branches: git contribute, git observe, and git park. More info at https://www.git-town.com/advanced-syncing and #3095.
All branches matching the regular expression in the new configuration setting branches.perennial-regex are now also considered perennial, in addition to the ones already listed in branches.perennials. This makes it easier to deal with situations where you have many perennial branches with similar sounding names like release-1, release-2, etc (#2659).

Bug Fixes

git town skip now works correctly in complex situations (#2978).
Git Town now deletes branches more reliably (#3097).

Statistics
Many thanks to @100rab-S, @harrismcc, @kevgo, @ruudk, @tranhl for contributing feedback, ideas, and solutions to 70 shipped PRs and 11 resolved issues!

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