Bump org.jetbrains.kotlin.kapt from 1.5.20 to 1.5.21 (#461)

Bumps org.jetbrains.kotlin.kapt from 1.5.20 to 1.5.21.

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.kapt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

doc-examples/example-kotlin/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id "org.jetbrains.kotlin.jvm" version "1.5.20"
-    id "org.jetbrains.kotlin.kapt" version "1.5.20"
+    id "org.jetbrains.kotlin.kapt" version "1.5.21"
 }
 
 ext.skipDocumentation=true