Bump org.springframework:spring-web in /dapr-spring (#1424)

Bumps [org.springframework:spring-web](https://github.com/spring-projects/spring-framework) from 6.1.20 to 6.1.21.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v6.1.20...v6.1.21)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

dapr-spring/pom.xml

@@ -35,7 +35,7 @@
     <junit.version>5.11.2</junit.version>
     <dapr.spring.version>0.16.0-SNAPSHOT</dapr.spring.version>
     <springboot.version>3.2.6</springboot.version>
-    <springframework.version>6.1.20</springframework.version>
+    <springframework.version>6.1.21</springframework.version>
     <logback-core.version>1.4.14</logback-core.version>
   </properties>