build(deps): bump org.springframework.boot in /modules/gs-gateway

Bumps org.springframework.boot from 3.1.4 to 3.1.5.

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

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

modules/gs-gateway/build.gradle

@@ -1,5 +1,5 @@
 plugins {
- id 'org.springframework.boot' version '3.1.4'
+ id 'org.springframework.boot' version '3.1.5'
  id 'io.spring.dependency-management' version '1.1.3'
  id 'java'
  id 'jacoco'