git-blame-ignore-revs: add postgresql cleanup

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.git-blame-ignore-revs
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# {pkgs/development/cuda-modules,pkgs/test/cuda,pkgs/top-level/cuda-packages.nix}: reformat all CUDA files with nixfmt-rfc-style 2023-03-01
802a1b4d3338f24cbc4efd704616654456d75a94
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# postgresql: move packages.nix to ext/default.nix
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719034f6f6749d624faa28dff259309fc0e3e730