[Security] Update various dependencies

[whistlingwoods]

What is it?

• Bug fix (user facing)
• Feature (user facing)
• Code base improvement (dev facing)
• Meta improvement to the project (dev facing)

Reference: #26 (comment)

Description of the changes in your PR

Update checkstyle / guava to Fix security vulnerability to 8.38
[Security] Update ktlint to 0.40.0
Update dependency for core library desugaring to 1.1.5 Upgrade ExoPlayer to 2.11.8
Update junit from 4.13 to 4.13.2
Update okhttp from 3.12.11 to 3.12.13
Upgrade PrettyTime to 5.0.6
& VARIOUS other dependencies

Fixes the following issue(s)

• Security Fixes & Updates

Relies on the following changes

This PR Updates the follwing dependencies

• checkstyle / guava 8.32 to 8.38
• core library desugaring 1.1.1 to 1.1.5
• ExoPlayer to 2.11.6 to 2.11.8
• groupieVersion = 2.8.0 2.8.1
• junit from 4.13 to 4.13.2
• ktlint to 0.35.0 to 0.40.0
• leakCanaryVersion = '2.2 to 2.5
• markwonVersion = '4.3.1 to 4.6.0
• okhttp from 3.12.11 to 3.12.13
• PrettyTime to 4.0.5 to 5.0.6 latest

Testing apk

debug.zip

Agreement

• I carefully read the contribution guidelines and agree to them.

[XiangRongLin]

Thanks for the effort, but as you already saw in my other post I'm not interested in maintaining this. So since I can't know if any incompatibilities occur through the updates I'
d rather not merge this.
Without the prettytime change I would just merge it and trust in semantic versioning.

[whistlingwoods]

I have pushed a commit to revert prettytime dependency upgrade however i'll test app without this change if found no problems that can be done in separate PR because latest prettytime 5.0.6 contains more localizations like inclusion of certain my local languages which more preunified users might want to take advantage of.