tools: improve styling of dependency diff comment

Author: wzieba

WordPress/build.gradle

@@ -640,9 +640,7 @@ tasks.register("dependencyTreeDiffCommentToGitHub", ViolationCommentsToGitHubTas
     commentOnlyChangedFiles = false
     minSeverity = SEVERITY.INFO
     commentTemplate = """
-### The PR caused the following dependency changes:
-
-<details><summary>expand</summary>
+<details><summary>The PR caused some dependency changes (expand to see details)</summary>
 <p>
 
 ```diff