build(deps): bump com.spotify.fmt:fmt-maven-plugin from 2.20 to 2.21.1

Bumps [com.spotify.fmt:fmt-maven-plugin](https://github.com/spotify/fmt-maven-plugin) from 2.20 to 2.21.1.
- [Release notes](https://github.com/spotify/fmt-maven-plugin/releases)
- [Commits](spotify/fmt-maven-plugin@fmt-maven-plugin-2.20...2.21.1)

---
updated-dependencies:
- dependency-name: com.spotify.fmt:fmt-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -58,7 +58,7 @@
             <plugin>
                 <groupId>com.spotify.fmt</groupId>
                 <artifactId>fmt-maven-plugin</artifactId>
-                <version>2.20</version>
+                <version>2.21.1</version>
                 <executions>
                     <execution>
                         <goals>