build(deps): Bump org.springframework:spring-web in /spring (#2918)

Bumps [org.springframework:spring-web](https://github.com/spring-projects/spring-framework) from 6.1.14 to 6.1.21.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.1.14...v6.1.21)

---
updated-dependencies:
- dependency-name: org.springframework:spring-web
  dependency-version: 6.1.21
  dependency-type: direct:production
...

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spring/pom.xml

@@ -31,7 +31,7 @@
 
   <properties>
     <main.java.version>17</main.java.version>
-    <spring.version>6.1.14</spring.version>
+    <spring.version>6.1.21</spring.version>
   </properties>
 
   <dependencies>