Update trigger-site-rebuild.yml

.github/workflows/trigger-site-rebuild.yml

@@ -9,7 +9,7 @@ jobs:
     - name: Install hunspell
       run: |
         sudo apt-get update
-        sudo apt-get install python-dev 
+        sudo apt-get install python-dev-is-python3 
         sudo apt-get install libhunspell-dev
         sudo pip install hunspell
     - uses: actions/checkout@v4