Update action.yml

Author: loicottet

.github/actions/build-graalvm/action.yml

@@ -49,7 +49,7 @@ runs:
       shell: bash
       run: |
         mkdir jdk-dl
-        ${MX_PATH}/mx --java-home= fetch-jdk --jdk-id labsjdk-ce-latest --to jdk-dl --alias ${LABSJDK_HOME}
+        ${MX_PATH}/mx --java-home= fetch-jdk --jdk-id labsjdk-ce-21 --to jdk-dl --alias ${LABSJDK_HOME}
     - name: Build GraalVM JDK
       shell: bash
       run: |
@@ -63,4 +63,4 @@ runs:
       with:
         distribution: 'oracle'
         java-version: '${{ inputs.java-version }}'
-  
+