chore(deps): bump docs/themes/docsy from bbf68d4 to 8a63d91

Bumps [docs/themes/docsy](https://github.com/google/docsy) from `bbf68d4` to `8a63d91`.
- [Release notes](https://github.com/google/docsy/releases)
- [Commits](google/docsy@bbf68d4...8a63d91)

---
updated-dependencies:
- dependency-name: docs/themes/docsy
  dependency-version: 8a63d915db53ee12038d194de126d5c2a17386d5
  dependency-type: direct:production
...

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

Author: dependabot[bot]