Remove checks from exapmple app

[no1seman]

Why need to point

cartridge-cli/examples/getting-started-app/getting-started-app-scm-1.rockspec

Line 10 in 8c642c7

'checks == 3.1.0-1',

in app rockspec when cartridge have checks as a dependency?

Seems need to remove, because when later user upgrades for examaple Cartridge version it may have later version of checks and on build/pack there are warnigs about multiple version which confusing.

[Totktonada]

As result some (latest? random?) version of a dependency is used everywhere. I think that it should be handled on luarocks make/install level.

Fixed dependencies is okay for an application. But we possibly should have relaxed dependencies in modules.