fix: TODO in app/build.gradle

[JakeHadley]

Description
There's a todo in the app/build.gradle:

    // TODO: Remove when below fix is available in stable channel.
    // https://github.com/flutter/flutter/pull/82309
    lintOptions {
        checkReleaseBuilds false
    }

Steps To Reproduce

1. Look at the app/build.gradle from a fresh project generation using the cli

Expected Behavior

Screenshots

Additional Context
The pull request referenced looks like it is merged into master as of may of 2021. Are there known side affects of removing this line currently?

[felangel]

This should be addressed in very_good_cli v0.7.10 🎉