Bump org.jetbrains.kotlin.plugin.spring in /examples

Bumps [org.jetbrains.kotlin.plugin.spring](https://github.com/JetBrains/kotlin) from 1.6.20 to 1.7.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.7.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.6.20...v1.7.20)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.plugin.spring
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

examples/spring-boot-kotlin-redis/build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id("org.springframework.boot") version "2.6.4"
     id("org.jetbrains.kotlin.jvm") version "1.6.21"
-    id("org.jetbrains.kotlin.plugin.spring") version "1.6.20"
+    id("org.jetbrains.kotlin.plugin.spring") version "1.7.20"
 }
 
 apply plugin: 'io.spring.dependency-management'