ci: Upgrade GitHub action versions

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/ci.yaml

@@ -2,9 +2,6 @@ name: frequenz-sdk-python
 
 on: [pull_request, push, workflow_dispatch]
 
-env:
-  REGISTRY: ghcr.io
-
 jobs:
   test:
     strategy:
@@ -17,17 +14,17 @@ jobs:
 
     steps:
       - name: Fetch sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           token: ${{ secrets.CI_ACCESS_TOKEN || github.token }}
           submodules: true
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/minimum-requirements-ci.txt') }}
@@ -49,17 +46,17 @@ jobs:
 
     steps:
     - name: Fetch sources
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         token: ${{ secrets.CI_ACCESS_TOKEN || github.token }}
         submodules: true
 
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: 3.8
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/minimum-requirements-ci.txt') }}
@@ -75,7 +72,7 @@ jobs:
       run: python -m pip wheel --no-deps -w dist .
 
     - name: upload wheels
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: frequenz-sdk-python-wheels
         path: dist/*.whl