Removing warning for forbidden apis not supporting java 14 (#55359)

While the current version of forbidden apis still does not support java
14, the warning message has become very noisy as we now require java 14
for the elasticsearch build. This commit replaces the warn log message
with a comment in the code.

Author: rjernst

buildSrc/src/main/groovy/org/elasticsearch/gradle/precommit/PrecommitTasks.groovy

@@ -153,10 +153,7 @@ class PrecommitTasks {
             dependsOn(buildResources)
             targetCompatibility = BuildParams.runtimeJavaVersion.majorVersion
             if (BuildParams.runtimeJavaVersion > JavaVersion.VERSION_13) {
-                project.logger.warn(
-                        "Forbidden APIs does not support Java versions past 13. Will use the signatures from 13 for {}.",
-                        BuildParams.runtimeJavaVersion
-                )
+                // forbidden apis does not yet support java 14 (it will in version 3.0), so we must use java 13 target
                 targetCompatibility = JavaVersion.VERSION_13.majorVersion
             }
             bundledSignatures = [