Bump org.springframework:spring-core in /adapters/oidc/spring-boot2

Bumps [org.springframework:spring-core](https://github.com/spring-projects/spring-framework) from 5.0.2.RELEASE to 6.0.15.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.0.2.RELEASE...v6.0.15)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
...

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

adapters/oidc/spring-boot2/pom.xml

@@ -77,7 +77,7 @@
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-core</artifactId>
-      <version>5.0.2.RELEASE</version>
+      <version>6.0.15</version>
       <scope>provided</scope>
     </dependency>
     <dependency>