Switch from python-version: 3.x to 3.12 to fix the htmlmin cgi module error.

Signed-off-by: PixelRobots <[email protected]>

Author: PixelRobots

.github/workflows/mkdocs.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.x
+          python-version: 3.12
       - uses: actions/cache@v3
         with:
           key: ${{ github.ref }}