update flopy in CI

Author: wpbonelli

.github/workflows/ci.yml

@@ -156,6 +156,10 @@ jobs:
           pip install -r requirements.pip.txt
           pip install -r requirements.usgs.txt
 
+      - name: Update flopy
+        working-directory: modflow6/autotest
+        run: python update_flopy.py
+
       - name: Build modflow6 example models
         if: steps.cache-examples.outputs.cache-hit != 'true'
         working-directory: modflow6-examples/etc
@@ -167,6 +171,7 @@ jobs:
           BIN_PATH: ~/.local/bin/modflow
           REPOS_PATH: ${{ github.workspace }}
           GITHUB_TOKEN: ${{ github.token }}
+          GITHUB_USER: "MODFLOW-USGS"
         run: pytest -v -n auto --durations 0 --ignore modflow_devtools/test/test_download.py
 
       - name: Run network-dependent tests