Bump mhausenblas/mkdocs-deploy-gh-pages from 1.12 to 1.26

Bumps [mhausenblas/mkdocs-deploy-gh-pages](https://github.com/mhausenblas/mkdocs-deploy-gh-pages) from 1.12 to 1.26.
- [Release notes](https://github.com/mhausenblas/mkdocs-deploy-gh-pages/releases)
- [Commits](mhausenblas/mkdocs-deploy-gh-pages@1.12...1.26)

---
updated-dependencies:
- dependency-name: mhausenblas/mkdocs-deploy-gh-pages
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/mkdocs-deploy.yml

@@ -13,7 +13,7 @@ jobs:
         uses: actions/checkout@v1
 
       - name: Deploy docs
-        uses: mhausenblas/mkdocs-deploy-gh-pages@1.12
+        uses: mhausenblas/mkdocs-deploy-gh-pages@1.26
         env:
           GITHUB_TOKEN: ${{ secrets.PERSONAL_TOKEN }}