.github/workflows/Test.yml: try to fix windows CI

Author: trabucayre

.github/workflows/Test.yml

@@ -158,7 +158,7 @@ jobs:
       jobs: ${{ steps.matrix.outputs.jobs }}
     steps:
     - id: matrix
-      uses: msys2/setup-msys2/matrix@main
+      uses: msys2/setup-msys2/matrix@v2.29.0
       with:
         systems: >-
           mingw64