Bump com.diffplug.spotless from 6.20.0 to 6.22.0 in /java (aws-observability#931)

Bumps com.diffplug.spotless from 6.20.0 to 6.22.0.

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

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Author: dependabot[bot]

java/settings.gradle.kts

@@ -1,6 +1,6 @@
 pluginManagement {
     plugins {
-        id("com.diffplug.spotless") version "6.20.0"
+        id("com.diffplug.spotless") version "6.22.0"
         id("com.github.ben-manes.versions") version "0.47.0"
         id("com.github.johnrengelman.shadow") version "8.1.1"
     }