go.mod: upgrade gin-gonic to latest version to avoid vulnerability

[venu-prasanna-tw]

We are using the latest version of [gopkg.in/DataDog/dd-trace-go.v1@v1.38.1] which internally uses the gin-gonic library and the version is [github.com/gin-gonic/gin@v1.7.0] in go.mod

This has introduced snyk vulnerability HTTP Response Splitting with the following path:
gopkg.in/DataDog/dd-trace-go.v1@v1.38.1 › github.com/gin-gonic/gin@v1.7.0

Snyk issue link: https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGINGONICGIN-1041736

In order to solve this issue gin-gonic library version has to upgraded to 1.7.7 or higher. can you please upgrade it.

I tried updating the library, but it fails when I try to push it to the new branch.

[nsrip-dd]

Thanks for reporting. I've opened #1341 to upgrade the dependency.