Update ci.yaml

Author: kezhenxu94

.github/workflows/ci.yaml

@@ -53,7 +53,7 @@ jobs:
           - os: ubuntu
             java-version: 21
     steps:
-      - if: matrix.os == "windows"
+      - if: matrix.os == 'windows'
         name: Support longpaths
         run: git config --system core.longpaths true
       - uses: actions/checkout@v2