Bumps gitdb/ext/smmap from 256c5a2 to 7d6f97c.

• 7d6f97c Merge pull request #55 from gitpython-developers/dependabot/github_actions/ac...
• 36dd418 Bump actions/setup-python from 4 to 5
• f1ace75 Merge pull request #54 from EliahKagan/312stable
• 44ac30a No longer treat 3.12 as experimental on CI
• 69cd90f Run CI on all branches
• 0257382 Merge pull request #53 from EliahKagan/ci
• f1ddf01 Update ci, in line with gitdb
• See full diff in compare view

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