build(deps): bump org.springframework.boot:spring-boot-dependencies (#247)

Bumps [org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot) from 3.5.14 to 3.5.15.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.14...v3.5.15)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-version: 3.5.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -18,7 +18,7 @@
   <packaging>pom</packaging>
 
   <properties>
-    <spring-boot.version>3.5.14</spring-boot.version>
+    <spring-boot.version>3.5.15</spring-boot.version>
     <process-engine-api.version>1.6</process-engine-api.version>
     <process-engine-adapters-c7.version>2026.06.1</process-engine-adapters-c7.version>
     <process-engine-adapters-c8.version>2026.06.1</process-engine-adapters-c8.version>