chore(deps): bump mkdocs-blogging-plugin from 2.2.5 to 2.2.9

Bumps [mkdocs-blogging-plugin](https://github.com/liang2kl/mkdocs-blogging-plugin) from 2.2.5 to 2.2.9.
- [Release notes](https://github.com/liang2kl/mkdocs-blogging-plugin/releases)
- [Commits](liang2kl/mkdocs-blogging-plugin@v2.2.5...v2.2.9)

---
updated-dependencies:
- dependency-name: mkdocs-blogging-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements/docs-blog.txt

@@ -274,9 +274,9 @@ mkdocs==1.4.3 \
     #   mkdocs-blogging-plugin
     #   mkdocs-material
     #   mkdocs-rss-plugin
-mkdocs-blogging-plugin==2.2.5 \
-    --hash=sha256:2cd8fce95ef912dd9aebf32304a07ce116adcc69b13ae412252a31f3b462c8c2 \
-    --hash=sha256:ba4718a4dad49e093e1e1e7a7bd05cd91e6dc9429c27dd6081f9a290a865bc5b
+mkdocs-blogging-plugin==2.2.9 \
+    --hash=sha256:5ba0c0bfc7ba3800176956d877feb93887585bf601c7506cd25333bd942ca1bd \
+    --hash=sha256:c847749d82896b033c7e562e7e6a2add1e2c3ac43c87908ff18fe527a900eff4
     # via -r requirements/docs-blog.in
 mkdocs-material==9.1.15 \
     --hash=sha256:8513ab847c9a541ed3d11a3a7eed556caf72991ee786c31c5aac6691a121088a \