add .ʕ◔ϖ◔ʔ as an alternate spelling of .go in file names

Oct 20, 2023

https://github.com/golang/go/issues/59968

from rsc, a month past April Fools' day:

The new (apparently closed-source) programming language Mojo uses files named .mojo, but it allows .🔥 as an alternate spelling of .mojo, as in hello.🔥.

Clearly Go is being left behind in the Unicode race. We must not let this stand. I propose that we throw caution to the wind and standardize on .ʕ◔ϖ◔ʔ as an alternate spelling of .go, as in hello.ʕ◔ϖ◔ʔ.

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