Update GH Action test-ci.yml dependencies

Updating version of checkout and setup-python actions.
Also making sure we install tox, tox-gh-actions into our venv.
Changes based on tox-gh-actions README.

Signed-off-by: Daniel Kutik <daniel.kutik@lavawerk.com>
Change-Id: I18946a8b41d5a3c350deee3ddbde77b4c0b3bdfe
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/353123
Reviewed-by: Mike Frysinger <vapier@google.com>
diff --git a/.github/workflows/test-ci.yml b/.github/workflows/test-ci.yml
index ff03eb2..0b9ef72 100644
--- a/.github/workflows/test-ci.yml
+++ b/.github/workflows/test-ci.yml
@@ -18,14 +18,14 @@
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install tox tox-gh-actions
+        python -m pip install tox tox-gh-actions
     - name: Test with tox
       run: tox