fix: Bump realm-gradle-plugin to 6.1.0 and fix build

[rob729]

Fixes #2473, #2380

[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Circle CI build is failing as of 810ef15. Here's the output:

Run Tests

> Task :assemble UP-TO-DATE

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

---

This comment was automagically generated by ci-reporter. If you see a problem, open an issue here.

[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Circle CI build is failing as of 810ef15. Here's the output:

Run Tests

> Task :assemble UP-TO-DATE

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

---

This comment was automagically generated by ci-reporter. If you see a problem, open an issue here.

[rob729]

@atm1504 @iamareebjamal Can you please re-trigger the ci build as I check for any possible reason for build fail but found none?

[liveHarshit]

Where is Travis

[atm1504]

Why did u add jcenter().

[rob729]

Because the build was failing and it was showing 7 libraries as failed to resolve.

[rob729]

@atm1504 can you please re-trigger the build or help me identify the reason for build fail error?

[rob729]

I don't think susi ai android uses Travis.

@atm1504 @iamareebjamal Can you please re-trigger the ci build as I check for any possible reason for build fail but found none?

[atm1504]

I don't think susi ai android uses Travis.

@atm1504 @iamareebjamal Can you please re-trigger the ci build as I check for any possible reason for build fail but found none?

Susi uses circle ci yml file not travis

[atm1504]

@rob729 check this out https://circleci.com/gh/fossasia/susi_android/5837?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

[iamareebjamal]

When compilation fails, do you just retry compiling again or try to fix the error?

[rob729]

The build error is fixed now. Please review the PR.