feat(nix): add mprocs

Signed-off-by: Seongmin Lee <boltlessengineer@proton.me>

boltless.me 8fb0364c f28f0ffa

verified
Changed files
+1
nix
+1
nix/flake.nix
··· 59 pkgs.janet 60 pkgs.jpm 61 pkgs.meld 62 pkgs.nodejs_24 63 pkgs.qmk 64 pkgs.ripgrep
··· 59 pkgs.janet 60 pkgs.jpm 61 pkgs.meld 62 + pkgs.mprocs 63 pkgs.nodejs_24 64 pkgs.qmk 65 pkgs.ripgrep