shebang: include php language in formula

[Moisan]

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Following #19649, when trying to use the new PHP shebang in a Formula, with include Language::PHP::Shebang, it raises this error: uninitialized constant Language::PHP. Adding this include in formula.rb, it works as expected.

[p-linnane]

Thanks @Moisan!

[MikeMcQuaid]

Thanks @Moisan!