[Java] Hide unstable updates.

build.gradle

@@ -945,3 +945,16 @@ tasks.register('copyTestLogs', Copy) {
 
     includeEmptyDirs = false
 }
+
+def isNonStable = { String version ->
+    def stableKeyword = ['RELEASE', 'FINAL', 'GA'].any { it -> version.toUpperCase().contains(it) }
+    def regex = /^[0-9,.v-]+(-r)?$/
+    return !stableKeyword && !(version ==~ regex)
+}
+
+tasks.named('dependencyUpdates').configure {
+    // Reject all non stable versions
+    rejectVersionIf {
+        isNonStable(it.candidate.version)
+    }
+}