Run spotless formatting (#958)

When we updated spotless's Java and Kotlin formatter, we changed the underlying
formatting rules.
However, due to spotless ratcheting, these formatting changes don't get applied unless a file
gets touched in a commit.

To avoid future PRs introducing lines of change that aren't related to the intention of the PR,
this is a one-time format of all files.

buildSrc/src/main/kotlin/MergeSourcesJars.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -111,7 +111,7 @@ open class MergeSourcesJars : DefaultTask() {
     relocatedPkgs: Map<String, String>,
     details: FileVisitDetails,
     sourceText: String,
-    importPattern: Pattern
+    importPattern: Pattern,
   ): String {
     val matcher = importPattern.matcher(sourceText)
     val buffer = StringBuffer()