Bump org.webjars:swagger-ui from 5.20.1 to 5.20.6 (#15300)

Bumps [org.webjars:swagger-ui](https://github.com/swagger-api/swagger-ui) from 5.20.1 to 5.20.6.
- [Release notes](https://github.com/swagger-api/swagger-ui/releases)
- [Changelog](https://github.com/swagger-api/swagger-ui/blob/master/.releaserc)
- [Commits](swagger-api/swagger-ui@v5.20.1...v5.20.6)

---
updated-dependencies:
- dependency-name: org.webjars:swagger-ui
  dependency-version: 5.20.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

dubbo-plugin/dubbo-rest-openapi/pom.xml

@@ -28,7 +28,7 @@
 
   <properties>
     <swagger-annotations.version>2.2.29</swagger-annotations.version>
-    <swagger-ui.version>5.20.1</swagger-ui.version>
+    <swagger-ui.version>5.20.6</swagger-ui.version>
     <redoc.version>2.2.0</redoc.version>
     <webjars-locator.version>1.0.1</webjars-locator.version>
     <therapi.version>0.15.0</therapi.version>