Remove NoDslVersion cop.

[reitermarkus]

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This syntax hasn't existed for ages at this point.

[apainintheneck]

Seems like this was added to the main brew repo in 2018 but existed before then in rubocop-cask.

commit 491ceb6c4ce05446f1b0ab73cff8a95101c7c695
Author: Mike McQuaid <mike@mikemcquaid.com>
Date:   Fri Oct 26 19:49:21 2018 +0100

    Import rubocop-cask (with clean brew style)

I agree that this probably isn't necessary anymore.

[Bo98]

Yeah we generally have kept these round for a while so that we can direct people to brew style --fix (like we did for bottle block syntax migration), but I agree that window of migration has probably been long exhausted so should be fine to clean up.

I'm assuming the old syntax would error in a current version of Homebrew, yes?

[MikeMcQuaid]

Fine with me, thanks @reitermarkus!