Bump spring.version from 6.0.9 to 6.0.12

Bumps `spring.version` from 6.0.9 to 6.0.12.

Updates `org.springframework:spring-core` from 6.0.9 to 6.0.12
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.0.9...v6.0.12)

Updates `org.springframework:spring-beans` from 6.0.9 to 6.0.12
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.0.9...v6.0.12)

Updates `org.springframework:spring-context` from 6.0.9 to 6.0.12
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.0.9...v6.0.12)

Updates `org.springframework:spring-test` from 6.0.9 to 6.0.12
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.0.9...v6.0.12)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-beans
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-context
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-test
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -23,7 +23,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.compiler.version>17</java.compiler.version>
 
-        <spring.version>6.0.9</spring.version>
+        <spring.version>6.0.12</spring.version>
         <elasticsearch.version>8.8.1</elasticsearch.version>
         <beyonder.version>8.6-SNAPSHOT</beyonder.version>
         <slf4j.version>2.0.7</slf4j.version>