Update CI-cygwin.yml

.github/workflows/CI-cygwin.yml

@@ -16,6 +16,8 @@ jobs:
       matrix:
         os: [windows-2019]
         arch: [x64, x86]
+        packages: |
+          gcc-g++-11.3.0-1
       fail-fast: false
 
     runs-on: ${{ matrix.os }}
@@ -27,6 +29,7 @@ jobs:
         uses: cygwin/cygwin-install-action@master
         with:
           platform: ${{ matrix.arch }}
+          packages: ${{ matrix.packages }}
 
       - name: Defines
         run: |