chore: bump org.springframework.boot in /spring-graphql-webflux (#3136)

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.4.1 to 3.4.2.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.1...v3.4.2)

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

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Author: dependabot[bot]

spring-graphql-webflux/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id 'org.springframework.boot' version '3.4.1'
+	id 'org.springframework.boot' version '3.4.2'
 	id 'io.spring.dependency-management' version '1.1.7'
 	id 'java'
 }