Invalidate old cache

Author: srikanthccv

Diff for: .github/workflows/test.yml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: .tox
-          key: tox-cache-${{ env.RUN_MATRIX_COMBINATION }}-${{ hashFiles('tox.ini', 'dev-requirements.txt') }}
+          key: tox-cache-v2-${{ env.RUN_MATRIX_COMBINATION }}-${{ hashFiles('tox.ini', 'dev-requirements.txt') }}
       - name: run tox
         run: tox -f ${{ matrix.python-version }}-${{ matrix.package }} -- --benchmark-json=${{ env.RUN_MATRIX_COMBINATION }}-benchmark.json
       - name: Find and merge benchmarks