build(deps): bump github.com/coreos/go-oidc/v3 in /examples (#3298)

Bumps [github.com/coreos/go-oidc/v3](https://github.com/coreos/go-oidc) from 3.7.0 to 3.9.0.
- [Release notes](https://github.com/coreos/go-oidc/releases)
- [Commits](https://github.com/coreos/go-oidc/compare/v3.7.0...v3.9.0

)

---
updated-dependencies:
- dependency-name: github.com/coreos/go-oidc/v3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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