Bump io.github.java-diff-utils:java-diff-utils from 4.12 to 4.15

Bumps [io.github.java-diff-utils:java-diff-utils](https://github.com/java-diff-utils/java-diff-utils) from 4.12 to 4.15.
- [Release notes](https://github.com/java-diff-utils/java-diff-utils/releases)
- [Changelog](https://github.com/java-diff-utils/java-diff-utils/blob/master/CHANGELOG.md)
- [Commits](java-diff-utils/java-diff-utils@java-diff-utils-parent-4.12...java-diff-utils-parent-4.15)

---
updated-dependencies:
- dependency-name: io.github.java-diff-utils:java-diff-utils
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pdx-tools/build.gradle

@@ -10,7 +10,7 @@ dependencies {
     implementation 'org.eclipse.collections:eclipse-collections-api:11.1.0'
     implementation 'org.eclipse.collections:eclipse-collections:11.1.0'
     implementation 'org.eclipse.collections:eclipse-collections-forkjoin:11.1.0'
-    implementation 'io.github.java-diff-utils:java-diff-utils:4.12'
+    implementation 'io.github.java-diff-utils:java-diff-utils:4.15'
 
     // testImplementation 'org.eclipse.collections:eclipse-collections-testutils:11.1.0'
 }