Bump @octokit/endpoint from 9.0.5 to 9.0.6 in /packages/attest

Bumps [@octokit/endpoint](https://github.com/octokit/endpoint.js) from 9.0.5 to 9.0.6.
- [Release notes](https://github.com/octokit/endpoint.js/releases)
- [Commits](octokit/endpoint.js@v9.0.5...v9.0.6)

---
updated-dependencies:
- dependency-name: "@octokit/endpoint"
  dependency-version: 9.0.6
  dependency-type: indirect
...

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

Author: dependabot[bot]