Bump spring-webflux from 5.3.17 to 5.3.18 in /examples/spring-framework

Bumps [spring-webflux](https://github.com/spring-projects/spring-framework) from 5.3.17 to 5.3.18.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.17...v5.3.18)

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

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

examples/spring-framework/pom.xml

@@ -139,7 +139,7 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webflux</artifactId>
-        <version>5.3.17</version>
+        <version>5.3.18</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>