CI: Use UCRT64 for python-pip check and package grokker

.github/workflows/main.yml

@@ -126,7 +126,7 @@ jobs:
       - uses: actions/download-artifact@v3
         continue-on-error: true
         with:
-          name: MINGW64-packages
+          name: UCRT64-packages
           path: C:/_/artifacts
       - name: Check whether to Run
         id: check-run
@@ -135,8 +135,8 @@ jobs:
       - uses: msys2/setup-msys2@v2
         if: steps.check-run.outputs.run == 'true'
         with:
-          msystem: MINGW64
-          install: mingw-w64-x86_64-python-pip
+          msystem: UCRT64
+          install: mingw-w64-ucrt-x86_64-python-pip
           release: false # since we aren't building anything
       - name: Add staging repo
         if: steps.check-run.outputs.run == 'true'
@@ -163,11 +163,11 @@ jobs:
         id: artifacts
         continue-on-error: true
         with:
-          name: MINGW64-packages
+          name: UCRT64-packages
           path: artifacts
       - name: Grok packages
         uses: jeremyd2019/package-grokker/grok-artifacts@main
         if: steps.artifacts.outcome == 'success'
         with:
-          repo: mingw64
+          repo: ucrt64
           path: artifacts