Use flake8 directly instead of through pytest-flake8

.github/workflows/build-and-test.yml

@@ -23,12 +23,15 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install pytest-flake8 pytest-cov
+        pip install flake8 pytest-cov
+    - name: Lint
+      run: |
+        flake8 .
     - name: Build
       run: |
         pip install -e .
     - name: Test
       run: |
-        pytest --flake8 --cov --cov-report=xml
+        pytest --cov --cov-report=xml
     - name: Upload coverage to codecov
       uses: codecov/codecov-action@v3

gcn/voeventclient.py

@@ -138,9 +138,9 @@ def _form_response(role, origin, response, timestamp):
 
 
 def _ingest_packet(sock, ivorn, handler, log):
-    """Ingest one VOEvent Transport Protocol packet and act on it, first sending
-    the appropriate response and then calling the handler if the payload is a
-    VOEvent."""
+    """Ingest one VOEvent Transport Protocol packet and act on it, first
+    sending the appropriate response and then calling the handler if the
+    payload is a VOEvent."""
     # Receive payload
     payload = _recv_packet(sock)
     log.debug("received packet of %d bytes", len(payload))