fix: update github action versions in pythonapp.yml

.github/workflows/pythonapp.yml

@@ -16,8 +16,8 @@ jobs:
   buildNix:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v16
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v18
         with:
           nix_path: nixpkgs=channel:nixpkgs-unstable
           extra_nix_config: access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
@@ -33,15 +33,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/cache@v2
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v3
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-
     - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.9.9
+        python-version: 3.9.15
     - name: Upgrade pip
       run: |
         python -m pip install --upgrade pip
@@ -67,7 +67,7 @@ jobs:
         -m "not benchmark and not skip_ci"
         tests
     - name: Upload coverage to codecov
-      uses: codecov/codecov-action@v2
+      uses: codecov/codecov-action@v3
       with:
         file: ./coverage.xml
         flags: unittests