build(deps): bump com.diffplug.spotless from 6.19.0 to 6.22.0

Bumps com.diffplug.spotless from 6.19.0 to 6.22.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ indra = "3.1.1"
 [plugins]
 indra = { id = "net.kyori.indra", version.ref = "indra" }
 indra-checkstyle = { id = "net.kyori.indra.checkstyle", version.ref = "indra" }
-spotless = { id = "com.diffplug.spotless", version = "6.19.0" }
+spotless = { id = "com.diffplug.spotless", version = "6.22.0" }
 spring-boot = { id = "org.springframework.boot", version = "3.1.1" }
 spring-dependency-management = { id = "io.spring.dependency-management", version = "1.1.1" }