chore(deps): update dependency com.diffplug.spotless:spotless-maven-plugin to v3.2.1 (#1825)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[com.diffplug.spotless:spotless-maven-plugin](https://redirect.github.com/diffplug/spotless)
| `3.2.0` → `3.2.1` |
![age](https://developer.mend.io/api/mc/badges/age/maven/com.diffplug.spotless:spotless-maven-plugin/3.2.1?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.diffplug.spotless:spotless-maven-plugin/3.2.0/3.2.1?slim=true)
|

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integration-tests/it-spring-boot-smoke-test/pom.xml

@@ -173,7 +173,7 @@
           <plugin>
             <groupId>com.diffplug.spotless</groupId>
             <artifactId>spotless-maven-plugin</artifactId>
-            <version>3.2.0</version>
+            <version>3.2.1</version>
             <configuration>
               <java>
                 <googleJavaFormat/>

prometheus-metrics-parent/pom.xml

@@ -82,7 +82,7 @@
           <plugin>
             <groupId>com.diffplug.spotless</groupId>
             <artifactId>spotless-maven-plugin</artifactId>
-            <version>3.2.0</version>
+            <version>3.2.1</version>
             <configuration>
               <java>
                 <googleJavaFormat/>