Bump plugin.spring from 1.6.21 to 1.9.10 in /shows-dgs

Bumps [plugin.spring](https://github.com/JetBrains/kotlin) from 1.6.21 to 1.9.10.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.9.10/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.6.21...v1.9.10)

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

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

Author: dependabot[bot]

shows-dgs/build.gradle.kts

@@ -20,7 +20,7 @@ plugins {
 	id("org.springframework.boot") version "2.6.7"
 	id("io.spring.dependency-management") version "1.0.12.RELEASE"
 	kotlin("jvm") version "1.7.10"
-	kotlin("plugin.spring") version "1.6.21"
+	kotlin("plugin.spring") version "1.9.10"
 	id("com.netflix.dgs.codegen") version "5.5.0"
 }