Bump git/ext/gitdb from `3d3e957` to `a8c894f`

[dependabot[bot]]

Bumps git/ext/gitdb from 3d3e957 to a8c894f.

Commits

• a8c894f Merge pull request #114 from edgarrmondragon/cp313
• b38cbc4 Use older ubuntu to get Python 3.7
• 5bc9504 Add support for Python 3.13
• 88da5ef Merge pull request #113 from blablatdinov/use-contextlib-suppress
• d50b2e3 Use contextlib.suppress instead of except: pass
• b653923 Merge pull request #109 from Clavss/fix-issue-101
• 24ecf58 fix #101
• ec58b7e Merge pull request #104 from EliahKagan/cadence
• 3753f72 Merge pull request #103 from EliahKagan/update-readme
• 9302789 Merge pull request #102 from EliahKagan/nopathmod
• Additional commits viewable in compare view

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