ci: updated outdated references to Python 3.9

Author: ErikBjare

.github/workflows/build.yml

@@ -240,7 +240,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.9"
+          python-version: ">=3.11"
 
       - name: Install deps
         run: |

.github/workflows/test.yml

@@ -57,7 +57,7 @@ jobs:
         if: ${{ env.new_version == 'this' }}
         uses: actions/download-artifact@v3
         with:
-          name: builds-Linux-py3.9
+          name: builds-Linux-py3.11
           path: dist
 
       # Only used during testing, so we don't have to wait for the main build job