dependency: disable renamed formula warning

[EricFromCanada]

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If a user has an older keg installed that refers to a dependency by an old name, after each install / uninstall / invocation of brew uses they'll see something like Warning: Formula atk was renamed to at-spi2-core. without context. I'm told this can be silenced since old names are symlinked anyway.

[MikeMcQuaid]

Makes sense, thanks for this @EricFromCanada!