Bump ex_doc from 0.30.3 to 0.30.4 (#476)

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.30.3 to 0.30.4.
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/main/CHANGELOG.md)
- [Commits](elixir-lang/ex_doc@v0.30.3...v0.30.4)

---
updated-dependencies:
- dependency-name: ex_doc
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

mix.lock

@@ -9,7 +9,7 @@
   "earmark_parser": {:hex, :earmark_parser, "1.4.33", "3c3fd9673bb5dcc9edc28dd90f50c87ce506d1f71b70e3de69aa8154bc695d44", [:mix], [], "hexpm", "2d526833729b59b9fdb85785078697c72ac5e5066350663e5be6a1182da61b8f"},
   "elixir_make": {:hex, :elixir_make, "0.7.7", "7128c60c2476019ed978210c245badf08b03dbec4f24d05790ef791da11aa17c", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}], "hexpm", "5bc19fff950fad52bbe5f211b12db9ec82c6b34a9647da0c2224b8b8464c7e6c"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
-  "ex_doc": {:hex, :ex_doc, "0.30.3", "bfca4d340e3b95f2eb26e72e4890da83e2b3a5c5b0e52607333bf5017284b063", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "fbc8702046c1d25edf79de376297e608ac78cdc3a29f075484773ad1718918b6"},
+  "ex_doc": {:hex, :ex_doc, "0.30.4", "e8395c8e3c007321abb30a334f9f7c0858d80949af298302daf77553468c0c39", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "9a19f0c50ffaa02435668f5242f2b2a61d46b541ebf326884505dfd3dd7af5e4"},
   "fast_html": {:hex, :fast_html, "2.2.0", "6c5ef1be087a4ed613b0379c13f815c4d11742b36b67bb52cee7859847c84520", [:make, :mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}], "hexpm", "064c4f23b4a6168f9187dac8984b056f2c531bb0787f559fd6a8b34b38aefbae"},
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
   "html5ever": {:hex, :html5ever, "0.15.0", "991a29a3076d5cd273684050c8f8ef183266be9db1501c76d769c4d756c4664e", [:mix], [{:rustler, ">= 0.0.0", [hex: :rustler, repo: "hexpm", optional: true]}, {:rustler_precompiled, "~> 0.5.2 or ~> 0.6.0", [hex: :rustler_precompiled, repo: "hexpm", optional: false]}], "hexpm", "2aae2073c45c0cd61f24a8ec9f2105824c445cb1affb15fda8df5beaaaac74ae"},