update sample apk

[KazuCocoa]

Proposed changes

• Update the sample apk to the latest one.
  • https://github.com/appium/android-apidemos
• bump ios os version

I ran Python tests.

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[vitalyk]

Hi @KazuCocoa.
Is it possible to have a look at build.gradle or to get a link to the GIT repo for the sample apk - ApiDemos-debug.apk?
I want to switch my test automation to Espresso but the apk that I'm testing on my project - doesn't work with the Espresso, only with the UiAutomator2.
Developers from my team are asking if that would be possible just to have a look at the source code, so they could try to adapt my test apk with the Espresso too.

Thanks ahead for your reply.

Regards Vitaliy

[KazuCocoa]

https://github.com/appium/android-apidemos is. (The link is in this PR's description as well)