Bump dependencies

[adimiz1]

Brief Summary of Changes

What does this PR solve? This PR solves the need to remove Jcenter since it stops it support at the end of March 2022, this fix comes to solve the following issue: https://github.com/cloudinary/cloudinary_android/issues/122

Root cause

The root cause for this PR is the need to remove dependency of the SDK on the Jcenter repo.

Additional features

We increased the minimal Java version to 8 We increased the minimal Android SDK to 19

What does this PR address?

• [x] GitHub issue (Add reference - #XX)
• [x] Refactoring
• [ ] New feature
• [ ] Bug fix
• [ ] Adds more tests

Are tests included?

• [x] Yes
• [ ] No

Reviewer, please note:

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I ran the full test suite before pushing the changes and all the tests pass.