update actions to @v4 and disable lint step

.github/workflows/python-app.yml

@@ -23,19 +23,19 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4 # update version to maintain consistency across workflows
     - name: Set up Python 3.10
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: '3.10'
-    - name: Lint with flake8
-      run: |
-        pip install flake8
-        make lint
+# deprecate: See lint.yml
+#    - name: Lint with flake8
+#      run: |
+#        pip install flake8
+#        make lint
     - name: Test with pytest
       run: |
         make up-test