[Backport 3.8] Pin checkstyle version to 13.9.0 (flow-framework) (#1454)

Pin checkstyle version to 13.9.0 (flow-framework) (#1453)

Pin checkstyle version to 13.9.0


(cherry picked from commit 5ff55cd)

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>
Signed-off-by: opensearch-ci-bot <opensearch-infra@amazon.com>
Co-authored-by: Peter Zhu <zhujiaxi@amazon.com>

Author: opensearch-ci-bot

build.gradle

@@ -119,7 +119,7 @@ allprojects {
     project.ext.licenseUrl = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
 
     checkstyle {
-        toolVersion = "latest.release"
+        toolVersion = "13.9.0"
     }
 
     // Avoid jar hell and other CVEs