fix(proposals): Simplify proposals action pipline

Signed-off-by: Chris Butler <[email protected]>

.github/workflows/proposals.yml

@@ -12,20 +12,12 @@ jobs:
         git config --global core.autocrlf false
 
     - uses: actions/checkout@v4
-      with:
-        submodules: true
 
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
         python-version: '3.11'
-
-    - uses: actions/cache@v4
-      with:
-        path: ~/.cache/pip
-        key: ubuntu-latest-proposals
-        restore-keys: |
-          ubuntu-latest-proposals
+        cache: 'pip'
 
     - name: Install trestle
       run: pip install -U compliance-trestle