flake: bump inputs

And remove the overlay for `none-ls`, which has been fixed.

This reverts commit ace266b02c.

overlays/none-ls-root-bug/default.nix

@@ -1,4 +0,0 @@
-self: prev:
-{
-  vimPlugins = prev.vimPlugins.extend (self.callPackage ./generated.nix { });
-}

overlays/none-ls-root-bug/generated.nix

@@ -1,14 +0,0 @@
-{ fetchpatch, ... }:
-
-_final: prev: {
-  none-ls-nvim = prev.none-ls-nvim.overrideAttrs (oa: {
-    patches = (oa.patches or [ ]) ++ [
-      # https://github.com/nvimtools/none-ls.nvim/pull/163
-      (fetchpatch {
-        name = "fix-get-root-directory.patch";
-        url = "https://github.com/nvimtools/none-ls.nvim/commit/2cde745aadc2c36f6860a77a556494870675771a.patch";
-        hash = "sha256-BtIjrT6ME2mR/5Ez9h+6r+fy0jYkBkw6/A9NConKRVs=";
-      })
-    ];
-  });
-}