Bump com.github.spotbugs from 6.1.12 to 6.1.13 in /libcobj (#651)

Bumps com.github.spotbugs from 6.1.12 to 6.1.13.

---
updated-dependencies:
- dependency-name: com.github.spotbugs
  dependency-version: 6.1.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

libcobj/app/build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
     id("java")
     id("maven-publish")
     pmd
-    id("com.github.spotbugs") version "6.1.12"
+    id("com.github.spotbugs") version "6.1.13"
 }
 
 repositories {