build(deps): bump spring.boot.version from 2.7.14 to 2.7.15

Bumps `spring.boot.version` from 2.7.14 to 2.7.15.

Updates `org.springframework.boot:spring-boot-configuration-processor` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

Updates `org.springframework.boot:spring-boot-starter` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

Updates `org.springframework.boot:spring-boot-starter-test` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

Updates `org.springframework.boot:spring-boot-starter-web` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

Updates `org.springframework.boot:spring-boot-starter-validation` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 2.7.14 to 2.7.15
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-configuration-processor
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-validation
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -56,7 +56,7 @@
         <axon.version>4.8.0</axon.version>
         <kafka.version>3.5.1</kafka.version>
         <!-- Spring -->
-        <spring.boot.version>2.7.14</spring.boot.version>
+        <spring.boot.version>2.7.15</spring.boot.version>
         <!-- Logging -->
         <slf4j.version>2.0.7</slf4j.version>
         <log4j.version>2.20.0</log4j.version>