feat(android): update gradle to 7.4.2

[m1ga]

resolves #13442

• update gradle tools to 7.4.2 (from 7.1.0)
• minor update to gradle build tools to 7.0.4 (from 7.0.1)
• minor update to kotlin to 1.6.21 (from 1.6.10)
• will give us Java 17 support (starting with 7.3.3; did all test with 7.3.3 first, then tested 7.4.2 and it worked too)
• added a section to the README how to update gradle

Tests I've did:

Javac 11

• javac --version -> 11.0.15
• build SDK
• build module with 11.0.0 -> run it in app with 10.1.1
• build app with 11.0.0

Javac 17

• javac --version -> 17.0.3
• build SDK
• build module with 11.0.0 -> run it in app with 10.1.1
• bulid app with 11.0.0
• run whole test suite (Android 13 emulator)
• run ./gradlew in build/android folder to check it shows version 7.4.2
• hyperloop examples
• build kotlin module

Note:

• javac 17 is not compatible with Ti 10.1.1.GA because of the older gradle version
• raising the gradle-build tools at https://github.com/tidev/titanium_mobile/blob/master/android/build.gradle#L16 to the latest version will show an error compiling the SDK. Not part of this PR but we should look at raising that at some point too

[jquick-axway]

Here's an example on how I updated gradle (and things related to it) in the past, if you think it helps. I usually test with hyperloop-examples to make sure it doesn't break hyperloop.
#12821

I'm pretty sure the newest JDK breaks kotlin too. You might want to upgrade the kotlin plugin as well. :)
I hope this helps!

[m1ga]

Hyperloop examples still work fine with this setup and I can compile my kotlin mlkit module + the test app. The :app:desugarDebugFileDependencies part takes a bit longer now but when I do a store build the APK is 3mb smaller.

edit: but I'll test the latest kotlin version. Might not be bad to update that

[caspahouzer]

LGTM