Bump spring-core in /workshops/oracleteq-kafka/springboot-kafka (#388)

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.3.18 to 5.3.19.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.18...v5.3.19)

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

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Author: dependabot[bot]

workshops/oracleteq-kafka/springboot-kafka/pom.xml

@@ -43,7 +43,7 @@
         <java.version>11</java.version>
         <javax-annotation.version>1.3.2</javax-annotation.version>
         <spring-boot.version>2.6.6</spring-boot.version>
-        <spring-core.version>5.3.18</spring-core.version>
+        <spring-core.version>5.3.19</spring-core.version>
         <spring-kafka.version>2.8.2</spring-kafka.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <oracle-jdbc.version>21.5.0.0</oracle-jdbc.version>