Update all dependencies to v7

| datasource | package                                                   | from   | to    |
| ---------- | --------------------------------------------------------- | ------ | ----- |
| maven      | com.diffplug.spotless:com.diffplug.spotless.gradle.plugin | 6.25.0 | 7.0.2 |
| maven      | com.diffplug.spotless:spotless-plugin-gradle              | 6.25.0 | 7.0.2 |

Author: renovate[bot]

libs.versions.toml

@@ -23,7 +23,7 @@ kover = "0.7.5"
 kotest = "5.8.0"
 assertj-core = "3.25.3"
 detekt = "1.23.5"
-spotless = "6.25.0"
+spotless = "7.0.2"
 apache-log4j = "2.22.1"
 testLogger = "4.0.0"
 jetbrains-annotations = "26.0.0"