Bump org.springframework.boot from 2.6.6 to 2.7.12

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 2.6.6 to 2.7.12.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.6...v2.7.12)

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

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

build.gradle.kts

@@ -21,7 +21,7 @@ val mainClass = "no.nav.familie.ba.infotrygd.Main"
 
 plugins {
     val kotlinVersion = "1.8.20"
-    val springBootVersion = "2.6.6"
+    val springBootVersion = "2.7.12"
     id("org.springframework.boot") version springBootVersion
     id("io.spring.dependency-management") version "1.1.0"
     kotlin("jvm") version kotlinVersion