switch to nixpkgs slack instead of homebrew

flake.lock

@@ -94,11 +94,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1675471726,
-        "narHash": "sha256-526iHwidfdtZZ7aAU9od1/zbyfSFBEailBTet+Gvfqg=",
+        "lastModified": 1676854489,
+        "narHash": "sha256-hWmx3JFLNPGMtflyjgEn5GZydbLW3msjXvarS1NsBDM=",
         "owner": "bandithedoge",
         "repo": "nixpkgs-firefox-darwin",
-        "rev": "813d55a3e3b3c0423eb5d1fcb4bf82197c9f7796",
+        "rev": "6a5cca0ea8dfab4718e1e43e243c80ba110c2364",
         "type": "github"
       },
       "original": {
@@ -176,11 +176,11 @@
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1675935446,
-        "narHash": "sha256-WajulTn7QdwC7QuXRBavrANuIXE5z+08EdxdRw1qsNs=",
+        "lastModified": 1678271387,
+        "narHash": "sha256-H2dv/i1LRlunRtrESirELzfPWdlG/6ElDB1ksO529H4=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "2dce7f1a55e785a22d61668516df62899278c9e4",
+        "rev": "36999b8d19eb6eebb41983ef017d7e0095316af2",
         "type": "github"
       },
       "original": {
@@ -301,11 +301,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1676973346,
-        "narHash": "sha256-rft8oGMocTAhUVqG3LW6I8K/Fo9ICGmNjRqaWTJwav0=",
+        "lastModified": 1676885936,
+        "narHash": "sha256-ZRKb6zBfTvdCOXI7nGC1L9UWSU5ay2ltxg+f5UIzBOU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d0d55259081f0b97c828f38559cad899d351cad1",
+        "rev": "b69883faca9542d135fa6bab7928ff1b233c167f",
         "type": "github"
       },
       "original": {
@@ -510,11 +510,11 @@
     },
     "utils": {
       "locked": {
-        "lastModified": 1667395993,
-        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "lastModified": 1676283394,
+        "narHash": "sha256-XX2f9c3iySLCw54rJ/CZs+ZK6IQy7GXNY4nSOyu2QG4=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "rev": "3db36a8b464d0c4532ba1c7dda728f4576d6d073",
         "type": "github"
       },
       "original": {