Bump swagger_version from 1.6.15 to 1.6.16 (#15398)

Bumps `swagger_version` from 1.6.15 to 1.6.16.

Updates `io.swagger:swagger-annotations` from 1.6.15 to 1.6.16

Updates `io.swagger:swagger-jaxrs` from 1.6.15 to 1.6.16

---
updated-dependencies:
- dependency-name: io.swagger:swagger-annotations
  dependency-version: 1.6.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.swagger:swagger-jaxrs
  dependency-version: 1.6.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

dubbo-dependencies-bom/pom.xml

@@ -169,7 +169,7 @@
     <activation_version>1.2.0</activation_version>
     <test_container_version>1.21.0</test_container_version>
     <hessian_lite_version>4.0.3</hessian_lite_version>
-    <swagger_version>1.6.15</swagger_version>
+    <swagger_version>1.6.16</swagger_version>
 
     <snappy_java_version>1.1.10.7</snappy_java_version>
     <bouncycastle-bcprov_version>1.70</bouncycastle-bcprov_version>