Enable windows

Author: m-dango

.github/workflows/exercises.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['ubuntu-22.04', 'macos-14']
+        os: ['ubuntu-22.04', 'macos-14', 'windows-2022']
     name: Rakudo Star on ${{ matrix.os }}
     steps:
       - name: Checkout