chore(deps): update dependency com.diffplug.spotless:spotless-maven-plugin to v3.8.0 (#333)

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[com.diffplug.spotless:spotless-maven-plugin](https://redirect.github.com/diffplug/spotless)
| `3.7.0` → `3.8.0` |
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|
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pom.xml

@@ -81,7 +81,7 @@
         <plugin>
           <groupId>com.diffplug.spotless</groupId>
           <artifactId>spotless-maven-plugin</artifactId>
-          <version>3.7.0</version>
+          <version>3.8.0</version>
           <configuration>
             <java>
               <googleJavaFormat>