Bump swagger-codegen

Bumps [swagger-codegen](https://github.com/swagger-api/swagger-codegen) from 2.3.1 to 2.4.19.
- [Release notes](https://github.com/swagger-api/swagger-codegen/releases)
- [Commits](swagger-api/swagger-codegen@v2.3.1...v2.4.19)

Signed-off-by: dependabot[bot] <support@github.com>

ibm/adapterGenerator/mfp-adapters-swagger-codegen/pom.xml

@@ -124,7 +124,7 @@
     </dependency>
   </dependencies>
   <properties>
-    <swagger-codegen-version>2.3.1</swagger-codegen-version>
+    <swagger-codegen-version>2.4.19</swagger-codegen-version>
     <maven-plugin-version>1.0.0</maven-plugin-version>
     <junit-version>4.8.1</junit-version>
   </properties>