Bump org.springframework.boot:spring-boot-dependencies (#75)

Bumps [org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot) from 3.2.8 to 3.2.9.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v3.2.8...v3.2.9)

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

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dependencies.gradle

@@ -1,5 +1,5 @@
 ext {
-    springBootVersion = '3.2.8'
+    springBootVersion = '3.2.9'
     springCloudVersion = '2023.0.3'
     springCloudAwsVersion = '3.0.4'