Bump gitpython from 3.1.18 to 3.1.20

[dependabot-preview[bot]]

Bumps gitpython from 3.1.18 to 3.1.20.

Commits

• 8530a8b prepare next patch release
• 254305c Merge pull request #1299 from Lakhtenkov-iv/feature/clone-options-support-spaces
• 717bfe9 Added support of spaces for clone multi_options
• c5e6ae2 Merge pull request #1298 from Yobmod/main
• be7bb86 Rmv with_metclass() shim again
• 6d6aae1 fix rdereddict, cannot subclass typing-extensiosn version
• 981cfa8 import ordereddict from types
• 04e181f put ordereddict behind py version guard
• 77ee247 change ordereddict to typing.ordereddict
• cb5688d Readd with_metaclass shim
• Additional commits viewable in compare view

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