Bump upstream from 901549e to b09015b (#70)

Bumps [upstream](https://github.com/bazelbuild/bazel) from `901549e` to `b09015b`.
- [Release notes](https://github.com/bazelbuild/bazel/releases)
- [Commits](bazelbuild/bazel@901549e...b09015b)

---
updated-dependencies:
- dependency-name: upstream
  dependency-version: b09015ba00184c902f036d496b51445199b81858
  dependency-type: direct:production
...

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Author: dependabot[bot]