Bump gitpython from 3.1.17 to 3.1.18 (#511)

Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.17 to 3.1.18.
- [Release notes](https://github.com/gitpython-developers/GitPython/releases)
- [Changelog](https://github.com/gitpython-developers/GitPython/blob/main/CHANGES)
- [Commits](gitpython-developers/GitPython@3.1.17...3.1.18)

---
updated-dependencies:
- dependency-name: gitpython
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,5 +1,5 @@
 radish-bdd==0.13.1
-gitpython==3.1.17
+gitpython==3.1.18
 netaddr==0.8.0
 colorful==0.5.4
 filetype==1.0.7

requirements_dev.txt

@@ -1,6 +1,6 @@
 radish-bdd==0.13.1
 mock==4.0.3
-gitpython==3.1.17
+gitpython==3.1.18
 netaddr==0.8.0
 colorful==0.5.4
 filetype==1.0.7