build(deps): bump org.springframework.boot in /java/gradle (#1195)

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.5.+ to 4.0.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/commits/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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

java/gradle/build.gradle

@@ -1,6 +1,6 @@
 plugins {
 	id 'java'
-	id 'org.springframework.boot' version '3.5.+'
+	id 'org.springframework.boot' version '4.0.+'
 	id 'io.spring.dependency-management' version '1.1.+'
 }