Fix Windows CI toolchain mismatch for g++

Author: lucasbellesi

.github/workflows/cpp-build.yml

@@ -31,9 +31,11 @@ jobs:
       - name: Setup MSYS2
         uses: msys2/setup-msys2@v2
         with:
+          msystem: MINGW64
+          path-type: inherit
           update: true
           install: >-
-            mingw-w64-ucrt-x86_64-gcc
+            mingw-w64-x86_64-gcc
 
       - name: Check markdown links
         shell: msys2 {0}