Update dependency com.diffplug.spotless to v7 (IntellectualSites#4565)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -35,7 +35,7 @@ serverlib = "2.3.6"
 # Gradle plugins
 shadow = "8.3.5"
 grgit = "4.1.1"
-spotless = "6.25.0"
+spotless = "7.0.0"
 nexus = "2.0.0"
 runPaper = "2.3.1"