Bump mkdocs-redirects from 1.2.2 to 1.2.3 in /docs/mkdocs (#5123)

Bumps [mkdocs-redirects](https://github.com/ProperDocs/properdocs-redirects) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/ProperDocs/properdocs-redirects/releases)
- [Commits](https://github.com/ProperDocs/properdocs-redirects/compare/v1.2.2...v1.2.3)

---
updated-dependencies:
- dependency-name: mkdocs-redirects
  dependency-version: 1.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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