Update dependency GitPython to <3.1.28

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
GitPython	<3.1.20 -> <3.1.28

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Release Notes

gitpython-developers/GitPython

v3.1.27

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v3.1.26

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v3.1.25

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v3.1.24

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v3.1.23

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v3.1.22

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v3.1.20

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v3.1.19

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Configuration

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