Address security vulnerbilities

[harshit-mehtaa]

In a recent scan of the Copybara code base, we observed some security vulnerabilities.

They are mainly around 4 packages

• Apache Tomcat 8.0.5
• Apache HTTP client 4.5.5
• Commons codec 1.11
• Google gson 2.8.5

The recommended solutions for these are to upgrade to a specific version.

[harshit-mehtaa]

I can create a PR but will need some guidance as to where exactly the fix needs to be added.