Dependency Upgrade to fix CVE Vulnerabilities

Currently the following dependency has ~24 CVE vulnerabilities and there is a latest version [2.7.2](https://mvnrepository.com/artifact/com.squareup.retrofit2/converter-jackson/2.7.2) of it that fixes these issues. Please bump up the version.

```xml
<dependency>
  <groupId>com.squareup.retrofit2</groupId>
  <artifactId>converter-jackson</artifactId>
  <version>2.7.2</version>
</dependency>