Bump upstream from 30ca509 to afd8d4b (#80)

Bumps [upstream](https://github.com/bazelbuild/bazel) from `30ca509` to `afd8d4b`.
- [Release notes](https://github.com/bazelbuild/bazel/releases)
- [Commits](bazelbuild/bazel@30ca509...afd8d4b)

---
updated-dependencies:
- dependency-name: upstream
  dependency-version: afd8d4bd0f0449dec1fb7a14f9e44b16cde72aaf
  dependency-type: direct:production
...

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Author: dependabot[bot]