Bump Polly from 7.2.4 to 8.2.1 in /gremlin-dotnet

Bumps [Polly](https://github.com/App-vNext/Polly) from 7.2.4 to 8.2.1.
- [Release notes](https://github.com/App-vNext/Polly/releases)
- [Changelog](https://github.com/App-vNext/Polly/blob/main/CHANGELOG.md)
- [Commits](https://github.com/App-vNext/Polly/compare/7.2.4...8.2.1)

---
updated-dependencies:
- dependency-name: Polly
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
1 file changed