chore(deps): bump pulsar from 6.7.2 to 6.9.1

Bumps [pulsar](https://github.com/streamnative/pulsar-rs) from 6.7.2 to 6.9.1.
- [Release notes](https://github.com/streamnative/pulsar-rs/releases)
- [Commits](streamnative/pulsar-rs@v6.7.2...v6.9.1)

---
updated-dependencies:
- dependency-name: pulsar
  dependency-version: 6.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]