update cache workflow

.github/workflows/tests.yaml

@@ -15,24 +15,17 @@ jobs:
       with:
         python-version: '3.x'
 
-    - name: Cache Dependencies
-      id: myCacheStep
-      uses: actions/cache@v2
-      env:
-        cache-name: cache-pip-modules
+    - uses: actions/cache@v1
       with:
-        path: ~/.pip
-        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/dev-requirements.txt') }}
         restore-keys: |
-          ${{ runner.os }}-build-${{ env.cache-name }}-
-          ${{ runner.os }}-build-
-          ${{ runner.os }}-
+          ${{ runner.os }}-pip-
 
-    - name: Install dependencies
-      if: steps.myCacheStep.outputs.cache-hit != 'true'
+    - name: Install Dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
       run: |
-        python -m pip install -U pip
-        python -m pip install -r dev-requirements.txt
+        pip install -r dev-requirements.txt
 
     - name: Linter
       run: make lint