Bump org.springframework.boot from 2.6.5 to 2.6.6

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 2.6.5 to 2.6.6.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.6.5...v2.6.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id("org.springframework.boot") version "2.6.5" apply false
+    id("org.springframework.boot") version "2.6.6" apply false
     id("io.spring.dependency-management") version "1.0.11.RELEASE" apply false
     kotlin("jvm") version "1.6.10" apply false
     kotlin("plugin.spring") version "1.6.10" apply false