build(deps): bump com.puppycrawl.tools:checkstyle

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.12.3 to 10.12.6.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.12.3...checkstyle-10.12.6)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

data-service/build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 ext {
-    checkstyleVersion = '10.12.3'
+    checkstyleVersion = '10.12.6'
 }
 
 sourceSets {