Update plugin com.diffplug.spotless to v7.0.3

Author: renovate[bot]

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
     `java-library`
     signing
 
-    id("com.diffplug.spotless") version "7.0.2"
+    id("com.diffplug.spotless") version "7.0.3"
     id("com.vanniktech.maven.publish") version "0.31.0"
 
     idea