Bump org.springframework.boot in /spring-boot-reactive

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.2.2 to 3.2.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.2...v3.2.3)

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

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

spring-boot-reactive/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     java
     application
-    id("org.springframework.boot") version "3.2.2"
+    id("org.springframework.boot") version "3.2.3"
     id("io.spring.dependency-management") version "1.1.4"
     id("com.google.cloud.tools.jib") version "3.4.0"
 }