Bump com.diffplug.spotless from 7.0.3 to 7.0.4 in /libcobj (#650)

Bumps com.diffplug.spotless from 7.0.3 to 7.0.4.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 7.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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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 "7.0.3"
+    id("com.diffplug.spotless") version "7.0.4"
     id("java")
     id("maven-publish")
     pmd