chore(deps): bump org.springframework.boot from 3.5.7 to 4.0.0

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.5.7 to 4.0.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.7...v4.0.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    id("org.springframework.boot") version "3.5.7"
+    id("org.springframework.boot") version "4.0.0"
     id("io.spring.dependency-management") version "1.1.7"
     id("java")
     id("com.google.cloud.tools.jib") version "3.5.1"