Clean up flake lockfile stuff

The `flake = false;` for `nix-eval-jobs` didn't fully take before.

Flake lock file updates:

• Removed input 'nix-eval-jobs/flake-parts'
• Removed input 'nix-eval-jobs/flake-parts/nixpkgs-lib'
• Removed input 'nix-eval-jobs/nix-github-actions'
• Removed input 'nix-eval-jobs/nixpkgs'
• Removed input 'nix-eval-jobs/treefmt-nix'
• Removed input 'nix-eval-jobs/treefmt-nix/nixpkgs'

flake.lock

@@ -1,26 +1,5 @@
 {
   "nodes": {
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "nix-eval-jobs",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1722555600,
-        "narHash": "sha256-XOQkdLafnb/p9ij77byFQjDf5m5QYl9b2REiVClC+x4=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "8471fe90ad337a8074e957b69ca4d0089218391d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
     "libgit2": {
       "flake": false,
       "locked": {
@@ -68,14 +47,7 @@
       }
     },
     "nix-eval-jobs": {
-      "inputs": {
-        "flake-parts": "flake-parts",
-        "nix-github-actions": [],
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "treefmt-nix": "treefmt-nix"
-      },
+      "flake": false,
       "locked": {
         "lastModified": 1739426028,
         "narHash": "sha256-1dZLPw+nlFQzzswfyTxW+8VF1AJ4ZvoYvLTjlHiz1SA=",
@@ -113,27 +85,6 @@
         "nix-eval-jobs": "nix-eval-jobs",
         "nixpkgs": "nixpkgs"
       }
-    },
-    "treefmt-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "nix-eval-jobs",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1723303070,
-        "narHash": "sha256-krGNVA30yptyRonohQ+i9cnK+CfCpedg6z3qzqVJcTs=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "14c092e0326de759e16b37535161b3cb9770cea3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
     }
   },
   "root": "root",