coq_8_13.src, coq_8_14.src, coq_8_15.src: update hash change with fetchzip update
coq_8_13.src, coq_8_14.src, coq_8_15.src: update hash change with fetchzip update

fetchzip changed unpacking of UTF-8 files on glibc systems:
    https://github.com/NixOS/nixpkgs/pull/176253
As a result unpacked contents changed it's filenames.

Closes: https://github.com/NixOS/nixpkgs/issues/176225

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