Bump the backend group with 3 updates

Bumps the backend group with 3 updates: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot), [org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot) and [org.springframework.boot:spring-boot-maven-plugin](https://github.com/spring-projects/spring-boot).


Updates `org.springframework.boot:spring-boot-starter-parent` from 3.1.7 to 3.2.1
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.1.7...v3.2.1)

Updates `org.springframework.boot:spring-boot-dependencies` from 3.1.7 to 3.2.1
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.1.7...v3.2.1)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.1.7 to 3.2.1
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.1.7...v3.2.1)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
...

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

pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.1.7</version>
+    <version>3.2.1</version>
     <relativePath/><!-- lookup parent from repository -->
   </parent>
 
@@ -43,7 +43,7 @@
     <jacoco-maven-plugin.version>0.8.11</jacoco-maven-plugin.version>
 
     <!-- 3rd-party library versions -->
-    <spring-boot-bom.version>3.1.7</spring-boot-bom.version>
+    <spring-boot-bom.version>3.2.1</spring-boot-bom.version>
     <junixsocket.version>2.8.3</junixsocket.version>
     <flyway.version>9.22.3</flyway.version>
     <artemis.version>2.31.2</artemis.version>