Bump mkdocs from 1.1.2 to 1.2.3 in /CI (#991)

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.1.2 to 1.2.3.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](https://github.com/mkdocs/mkdocs/compare/1.1.2...1.2.3)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alexandra Tran <12214231+alexandratran@users.noreply.github.com>

CI/requirements.txt

@@ -1,4 +1,4 @@
-mkdocs==1.1.2
+mkdocs==1.2.3
 mkdocs-material==6.1.7
 Markdown==3.2.1
 markdown-fenced-code-tabs==1.0.3