Bump matrix-org/backend-meta from 1 to 2 (#15156)

* Bump matrix-org/backend-meta from 1 to 2

Bumps [matrix-org/backend-meta](https://github.com/matrix-org/backend-meta) from 1 to 2.
- [Release notes](https://github.com/matrix-org/backend-meta/releases)
- [Commits](https://github.com/matrix-org/backend-meta/compare/v1...v2

)

---
updated-dependencies:
- dependency-name: matrix-org/backend-meta
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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* Changelog

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