chore: configure Windows' CI toolchain explicitly (#192)

Author: ianbotsf

.github/workflows/ci.yaml

@@ -154,7 +154,7 @@ jobs:
           msystem: MINGW64
           install: >-
             mingw-w64-x86_64-cmake
-            mingw-w64-x86_64-gcc
+            mingw-w64-x86_64-toolchain
       - name: Setup build environment
         uses: ./.github/actions/setup-build
       - name: Build and Test ${{ env.PACKAGE_NAME }}