Bump github.com/apple/swift-docc-plugin from 1.4.3 to 1.4.5

---
updated-dependencies:
- dependency-name: github.com/apple/swift-docc-plugin
  dependency-version: 1.4.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]