Bump spring-core from 5.3.14 to 5.3.18 in /tests/examples/JDBC/taosdemo (#11175)

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.3.14 to 5.3.18.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.14...v5.3.18)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
...
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tests/examples/JDBC/taosdemo/pom.xml

@@ -10,7 +10,7 @@
     <description>Demo project for TDengine</description>
 
     <properties>
-        <spring.version>5.3.14</spring.version>
+        <spring.version>5.3.18</spring.version>
     </properties>
 
     <dependencies>