Update dependency com.diffplug.spotless:com.diffplug.spotless.gradle.plugin to v5.7.0 (#618)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     base
     id("com.diffplug.eclipse.apt") version "3.25.0" apply false
-    id("com.diffplug.spotless") version "5.6.1"
+    id("com.diffplug.spotless") version "5.7.0"
     id("de.marcphilipp.nexus-publish") version "0.4.0" apply false
     id("io.codearte.nexus-staging") version "0.22.0"
     id("net.researchgate.release") version "2.8.1"