Bump com.diffplug.spotless from 7.1.0 to 7.2.1 in /libcobj (#682)

Bumps com.diffplug.spotless from 7.1.0 to 7.2.1.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 7.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

libcobj/app/build.gradle.kts

@@ -3,7 +3,7 @@ import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 plugins {
     application
     id("com.github.johnrengelman.shadow") version "8.1.1"
-    id("com.diffplug.spotless") version "7.1.0"
+    id("com.diffplug.spotless") version "7.2.1"
     id("java")
     id("maven-publish")
     pmd