Bump com.diffplug.spotless from 6.9.0 to 6.9.1 (#790)

Bumps com.diffplug.spotless from 6.9.0 to 6.9.1.

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

settings.gradle

@@ -8,7 +8,7 @@ pluginManagement {
         id 'com.avast.gradle.docker-compose' version "0.16.8" apply false
         id 'io.gitlab.arturbosch.detekt' version "1.21.0" apply false
         id 'com.apollographql.apollo3' version "3.5.0" apply false
-        id 'com.diffplug.spotless' version '6.9.0' apply false
+        id 'com.diffplug.spotless' version '6.9.1' apply false
     }
 }