Bump spring-core in /examples-mule4-ignite-connector

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.1.0.RELEASE to 5.2.22.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.1.0.RELEASE...v5.2.22.RELEASE)

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

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

examples-mule4-ignite-connector/pom.xml

@@ -25,7 +25,7 @@
 
     <!-- we will use Hawkore's Apache Ignite version with advanced indexing support -->
     <ignite.version>2.8.3-hk</ignite.version>
-    <spring.version>5.1.0.RELEASE</spring.version>
+    <spring.version>5.2.22.RELEASE</spring.version>
     <spring.security.version>5.1.0.RELEASE</spring.security.version>
 
   </properties>