Fix java env formatting

Author: cindy-peng

.github/workflows/ci.yaml

@@ -73,7 +73,7 @@ jobs:
       # Maven surefire plugin (unit tests) allows us to specify JVM to run the tests.
       # https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#jvm
 #      run: echo "SUREFIRE_JVM_OPT=-Djvm=${JAVA_HOME}/bin/java" >> $GITHUB_ENV
-      run: echo "JAVA=${JAVA_HOME}/bin/java" >> $GITHUB_ENV
+      run: echo "JAVA=${JAVA_HOME}\bin\java" >> $GITHUB_ENV
       shell: bash
     - uses: actions/setup-java@v4
       with: