nixos-render-docs: drop frozendict

with mypy type checking and Mapping types this is a lot less useful than
anticipated. let's drop it for simplicity and having fewer dependencies.

frozendict 2.3.5 also broke the mypy checks.

pkgs/tools/nix/nixos-render-docs/default.nix

@@ -24,18 +24,15 @@ let
   };
 
   makeDeps = pkgs: small:
-    [ pkgs.frozendict ]
-    ++ (
-      if small
-      then [
-        markdown-it-py-no-tests
-        mdit-py-plugins-no-tests
-      ]
-      else [
-        pkgs.markdown-it-py
-        pkgs.mdit-py-plugins
-      ]
-    );
+    if small
+    then [
+      markdown-it-py-no-tests
+      mdit-py-plugins-no-tests
+    ]
+    else [
+      pkgs.markdown-it-py
+      pkgs.mdit-py-plugins
+    ];
 in
 
 python.pkgs.buildPythonApplication rec {

pkgs/tools/nix/nixos-render-docs/src/nixos_render_docs/docbook.py

@@ -1,5 +1,4 @@
 from collections.abc import Mapping, MutableMapping, Sequence
-from frozendict import frozendict # type: ignore[attr-defined]
 from typing import Any, cast, Optional, NamedTuple
 
 import markdown_it

pkgs/tools/nix/nixos-render-docs/src/nixos_render_docs/md.py

@@ -1,6 +1,5 @@
 from abc import ABC
 from collections.abc import Mapping, MutableMapping, Sequence
-from frozendict import frozendict # type: ignore[attr-defined]
 from typing import Any, Callable, cast, get_args, Iterable, Literal, NoReturn, Optional
 
 import dataclasses
@@ -458,7 +457,7 @@ class Converter(ABC):
     __renderer__: Callable[[Mapping[str, str], markdown_it.MarkdownIt], Renderer]
 
     def __init__(self, manpage_urls: Mapping[str, str]):
-        self._manpage_urls = frozendict(manpage_urls)
+        self._manpage_urls = manpage_urls
 
         self._md = markdown_it.MarkdownIt(
             "commonmark",

pkgs/tools/nix/nixos-render-docs/src/nixos_render_docs/options.py

@@ -204,7 +204,7 @@ class DocBookConverter(BaseConverter):
     __renderer__ = OptionsDocBookRenderer
     __option_block_separator__ = ""
 
-    def __init__(self, manpage_urls: dict[str, str],
+    def __init__(self, manpage_urls: Mapping[str, str],
                  revision: str,
                  markdown_by_default: bool,
                  document_type: str,