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tigervnc: use `tag` and `hash` in `fetchFromGitHub`
* `sha256` -> `hash` * `rev` -> `tag`, inspired by https://github.com/NixOS/nixpkgs/commit/cb9f9a1e5a51a87d59b373db7016cee1608debd5
* `sha256` -> `hash` * `rev` -> `tag`, inspired by https://github.com/NixOS/nixpkgs/commit/cb9f9a1e5a51a87d59b373db7016cee1608debd5