chore(deps): update actions/cache action to v3 (#34)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/merge.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Cache virtualenvironment
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.venv
           key: ${{ hashFiles('requirements.txt', 'requirements-dev.txt') }}

.github/workflows/pullrequest.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Cache virtualenvironment
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.venv
           key: ${{ hashFiles('requirements.txt', 'requirements-dev.txt') }}

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Cache virtualenvironment
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.venv
           key: ${{ hashFiles('requirements.txt', 'requirements-dev.txt') }}