Deps: Bump exceptiongroup

Bumps the dependencies group in /backport-pull-request with 1 update: [exceptiongroup](https://github.com/agronholm/exceptiongroup).


Updates `exceptiongroup` from 1.2.0 to 1.2.1
- [Release notes](https://github.com/agronholm/exceptiongroup/releases)
- [Changelog](https://github.com/agronholm/exceptiongroup/blob/main/CHANGES.rst)
- [Commits](agronholm/exceptiongroup@1.2.0...1.2.1)

---
updated-dependencies:
- dependency-name: exceptiongroup
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>