chore(deps): bump com.ncorti.ktfmt.gradle:plugin in /android

Bumps com.ncorti.ktfmt.gradle:plugin from 0.15.1 to 0.21.0.

---
updated-dependencies:
- dependency-name: com.ncorti.ktfmt.gradle:plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

android/build.gradle

@@ -26,7 +26,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:8.4.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.ncorti.ktfmt.gradle:plugin:0.15.1'
+        classpath 'com.ncorti.ktfmt.gradle:plugin:0.21.0'
     }
 }