Specify requirements explicitly

Since we're an action, we're not the current directory.

Author: PeterJCLaw

action.yml

@@ -8,10 +8,11 @@ runs:
       with:
         python-version: '3.10'
         cache: pip
+        cache-dependency-path: ${{ github.action_path }}/requirements.txt
 
     - name: Install Dependencies
       shell: bash
-      run: pip install -U -r requirements.txt
+      run: pip install -U -r ${{ github.action_path }}/requirements.txt
 
     - name: Run Compstate Validation
       shell: bash