Bump gitdb/ext/smmap from f31bfa3 to 8f82e6c

Bumps [gitdb/ext/smmap](https://github.com/gitpython-developers/smmap) from `f31bfa3` to `8f82e6c`.
- [Release notes](https://github.com/gitpython-developers/smmap/releases)
- [Commits](gitpython-developers/smmap@f31bfa3...8f82e6c)

---
updated-dependencies:
- dependency-name: gitdb/ext/smmap
  dependency-type: direct:production
...

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Author: dependabot[bot]