WIP: fix(android): Fix deprecated left shift usage (support was removed in Gradle 5)

[breautek]

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Platforms affected

Android

Motivation and Context

Fixes #425 Also required for #471

Description

Removed deprecated << syntax in Gradle (<< support was removed in Gradle 5) and replaced it with the equivalent.

Testing

Manual tests

Checklist

• [x] I've run the tests to see all new and existing tests pass
• [x] I added automated test coverage as appropriate for this change
• [x] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [x] I've updated the documentation if necessary