Bump swagger-core from 1.6.7 to 1.6.8 (#2823)

Bumps [swagger-core](https://github.com/swagger-api/swagger-core) from 1.6.7 to 1.6.8.
- [Release notes](https://github.com/swagger-api/swagger-core/releases)
- [Commits](swagger-api/swagger-core@v1.6.7...v1.6.8)

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

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elide-swagger/pom.xml

@@ -85,7 +85,7 @@
        <dependency>
             <groupId>io.swagger</groupId>
             <artifactId>swagger-core</artifactId>
-            <version>1.6.7</version>
+            <version>1.6.8</version>
        </dependency>
 
        <!-- Needed by swagger-core but not listed as a dependency -->