Drop specialisation and devenv update and flake update

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1790215976,
-        "narHash": "sha256-VkR1rMGyjU9jtw8ISFx5uqR9e+LEaOlhHwrseFkiIVk=",
+        "lastModified": 1790996401,
+        "narHash": "sha256-f+kOxEmOUnQazVAmGg0i8hzwgd1kX/geY+k/Dpheye8=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "a6631107a83ceab5872f298a2ea710859c80c4cb",
+        "rev": "db7d5e2332710f5abb088f6b5de927d7f9511b35",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1790635395,
-        "narHash": "sha256-bNyvoIyOCu7lzoCpWKWGIsHpTtERUWzqYWFPlN++WTw=",
+        "lastModified": 1791143449,
+        "narHash": "sha256-9+n3ReS2y9xS199LoJjKUWHwZrISGHWgkD/LUZTDZyA=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "7fc6f2c20af09cdcaf48b92ec3121860139ec668",
+        "rev": "0d9e9b832d03ac387417e16ce1febf73b2e631e1",
         "type": "github"
       },
       "original": {
@@ -54,11 +54,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1790600678,
-        "narHash": "sha256-6k3n7X2UsZ6tAlWTz99RimiZab+17tMUrw9sRUcELiA=",
+        "lastModified": 1791161550,
+        "narHash": "sha256-hUcT0jKmSHN5XgRW3sSEIIlqsVClkVfToluYtOd56ok=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f45c6f04c2f013f004bf94e284e95d72898d9393",
+        "rev": "8c6b39505383e6d5dcb431f00cb3597b71f8045c",
         "type": "github"
       },
       "original": {