Bump dawidd6/action-download-artifact from 2 to 6 in /.github/workflows (#1149)

- Bump dawidd6/action-download-artifact from v2 to v6.
- Bump all remaining actions/download-artifact and actions/upload-artifact from v3 to v4.
- Undo workarounds from #939.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: reneSchm <49305466+reneSchm@users.noreply.github.com>

Author: dependabot[bot]

.github/actions/build-py/action.yml

@@ -30,15 +30,8 @@ runs:
           cp dist/*.whl wheelhouse
         fi
         cp -r wheelhouse ..
-    - name: Upload Python Wheels Simulation # See Issue #939
-      uses: actions/upload-artifact@v3
-      if: inputs.package == 'simulation'
-      with:
-        name: python-wheels-${{ inputs.package }}
-        path: pycode/wheelhouse
     - name: Upload Python Wheels
       uses: actions/upload-artifact@v4
-      if: inputs.package != 'simulation'
       with:
         name: python-wheels-${{ inputs.package }}
         path: pycode/wheelhouse

.github/actions/test-py/action.yml

@@ -25,26 +25,19 @@ runs:
           sudo apt-get -qq -y install python3-pip gnupg
         fi
         python -m pip install --upgrade pip
-    - name: Download Python Wheels Simulation
-      uses: actions/download-artifact@v3
-      if: inputs.package == 'simulation' #WORKAROUND! See Issue #939
-      with:
-        name: python-wheels-${{ inputs.package }}
-        path: pycode/wheelhouse
     - name: Download Python Wheels
       uses: actions/download-artifact@v4
-      if: inputs.package != 'simulation'
       with:
         name: python-wheels-${{ inputs.package }}
         path: pycode/wheelhouse
-    - name: Download additional Python Wheels for plot package
+    - name: Download Python Wheels from epidata for plot package
       uses: actions/download-artifact@v4
       if:  inputs.package == 'plot'
       with:
         name: python-wheels-epidata
         path: pycode/wheelhouse
-    - name: Download Python Wheels for surrogatemodel
-      uses: actions/download-artifact@v3 #WORKAROUND! Upgrade to v4 asap. See Issue #939
+    - name: Download Python Wheels from simulation for surrogatemodel
+      uses: actions/download-artifact@v4
       if:  inputs.package == 'surrogatemodel'
       with:
         name: python-wheels-simulation

.github/workflows/main.yml

@@ -371,7 +371,7 @@ jobs:
           name: test-cpp-coverage-reports
       - name: Download pylint report
         #if an error occurs here, the pylint report was not built, probably manually trigger epidata-ci
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
             github_token: ${{secrets.GITHUB_TOKEN}}
             workflow: epidata_main.yml