ci: update docs generator checkout method

Replaced checkout action with git clone for docs generator.

Author: haithium

.github/workflows/generate-docs.yml

@@ -20,10 +20,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Checkout docs generator
-        uses: actions/checkout@v6
-        with:
-          repository: BlueLua/bluelua.github.io
-          path: ${{ runner.temp }}/docgen
+        run: git clone --depth 1 https://github.com/BlueLua/bluelua.github.io.git "${RUNNER_TEMP}/docgen"
 
       - name: Setup Lua
         uses: leafo/gh-actions-lua@v13