Bump springBootVersion from 3.0.12 to 3.1.5

Bumps `springBootVersion` from 3.0.12 to 3.1.5.

Updates `org.springframework.boot:spring-boot-gradle-plugin` from 3.0.12 to 3.1.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.12...v3.1.5)

Updates `org.springframework.boot:spring-boot-starter-web` from 3.0.12 to 3.1.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.0.12...v3.1.5)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        springBootVersion = "3.0.12"
+        springBootVersion = "3.1.5"
         httpclientVersion = "4.5.14"
         aerospikeClientVersion = findProperty("aerospikeClientVersion") ?: "7.1.0"
     }