Bump docs/themes/docsy from 55e0ce2 to dd72a27

Bumps [docs/themes/docsy](https://github.com/google/docsy) from `55e0ce2` to `dd72a27`.
- [Release notes](https://github.com/google/docsy/releases)
- [Commits](google/docsy@55e0ce2...dd72a27)

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

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