flake: bump inputs

And remove the overlay for `lsp-format.nvim`, which has been fixed.

This reverts commit 92e5fbe7df.

overlays/lsp-format-nvim-indentation/default.nix

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

overlays/lsp-format-nvim-indentation/generated.nix

@@ -1,14 +0,0 @@
-{ fetchpatch, ... }:
-
-_final: prev: {
-  lsp-format-nvim = prev.lsp-format-nvim.overrideAttrs (oa: {
-    patches = (oa.patches or [ ]) ++ [
-      # https://github.com/lukas-reineke/lsp-format.nvim/issues/94
-      (fetchpatch {
-        name = "use-effective-indentation";
-        url = "https://github.com/liskin/lsp-format.nvim/commit/3757ac443bdf5bd166673833794553229ee8d939.patch";
-        hash = "sha256-Dv+TvXrU/IrrPxz2MSPbLmRxch+qkHbI3AyFMj/ssDk=";
-      })
-    ];
-  });
-}