Bump swaggerVersion from 2.2.20 to 2.2.21 in /Plan (#3532)

Bumps `swaggerVersion` from 2.2.20 to 2.2.21.

Updates `io.swagger.core.v3:swagger-core-jakarta` from 2.2.20 to 2.2.21

Updates `io.swagger.core.v3:swagger-jaxrs2-jakarta` from 2.2.20 to 2.2.21

---
updated-dependencies:
- dependency-name: io.swagger.core.v3:swagger-core-jakarta
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.swagger.core.v3:swagger-jaxrs2-jakarta
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Plan/build.gradle

@@ -108,7 +108,7 @@ subprojects {
         junitVersion = "5.10.2"
         mockitoVersion = "5.11.0"
         testContainersVersion = "1.19.7"
-        swaggerVersion = "2.2.20"
+        swaggerVersion = "2.2.21"
     }
 
     repositories {