Dependency Update: webkit2gtk4.0 -> webkit2gtk4.1

[tdug]

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Addresses https://github.com/juce-framework/JUCE/issues/1377

I'm not knowledgeable enough with C++/CMake for it to be obvious to me how to allow either version of this dependency. Would love some feedback if this is possible so I don't break any builds that cannot install webkit2gtk-4.1 for some reason.

This was a simple find&replace. I'm not sure if there's anything else to update here.