chore(deps): update plugin org.jetbrains.kotlin.plugin.spring to v2.1.20 (#164)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle.kts

@@ -5,7 +5,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 plugins {
     id("org.springframework.boot") version "3.4.0"
     kotlin("jvm") version "2.1.10"
-    kotlin("plugin.spring") version "2.1.10"
+    kotlin("plugin.spring") version "2.1.20"
 
     // graphql plugins
     id("com.expediagroup.graphql") version "8.4.0"