This PR updates kotlin to the latest version 1.6.0. We had some failures related to the kotlin version today in #15641 and instead of addressing that with a temporary solution, I decided to put in the time to update to the latest version. Here is a summary of the changes:

• Updates kotlinVersion to 1.6.0 & coroutinesVersion to 1.5.2
• Updates daggerVersion to 2.40.3 to fix build errors due to kotlin version update
• Specifies com.android.tools:r8 version to fix this issue: https://issuetracker.google.com/issues/194915678
• Replaces deprecated maxBy with maxByOrNull
• Removes ExperimentalStdlibApi annotation as it's no longer necessary in our case
• Removes InternalCoroutinesApi & ExperimentalCoroutinesApi annotations from a few classes where they weren't necessary (I don't think I got them all, but I didn't want to sink more time into this PR)
• Replaces deprecated UseExperimental with OptIn

To test:
Smoke test the app. It's unlikely that these changes will have any impact on the application as the changes should be limited to compilation. Unfortunately there is no good way to verify that, so I think all we can do is smoke test the app and address anything that might come up in the future.

Regression Notes

1. Potential unintended areas of impact

• Compile errors that might not be covered by our regular CI integration (such as release builds)
• Possibly some issues in the app, but I think this is very unlikely and there is no specific area to focus

2. What I did to test those areas of impact (or what existing automated tests I relied on)

• Smoke tested the app and mainly focused on getting successful builds in CI & local environment.

3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.