Bump ex_doc from 0.30.3 to 0.30.4

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](https://github.com/elixir-lang/ex_doc/compare/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>

mix.lock

@@ -47,7 +47,7 @@
   "ex_cldr_lists": {:hex, :ex_cldr_lists, "2.10.0", "4d4c9877da2d0417fd832907d69974e8328969f75fafc79b05ccf85f549f6281", [:mix], [{:ex_cldr_numbers, "~> 2.25", [hex: :ex_cldr_numbers, repo: "hexpm", optional: false]}, {:ex_doc, "~> 0.18", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "adc040cde7b97f7fd7c0b35dd69ddb6fcf607303ae6355bb1851deae1f8b0652"},
   "ex_cldr_numbers": {:hex, :ex_cldr_numbers, "2.31.3", "6ec8b18c395c0e8788d46da806f8f2abcbe4b0d809226d2a91363e9ccd85f2f5", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:digital_token, "~> 0.3 or ~> 1.0", [hex: :digital_token, repo: "hexpm", optional: false]}, {:ex_cldr, "~> 2.37", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_cldr_currencies, ">= 2.14.2", [hex: :ex_cldr_currencies, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "b519de08ecc4a6402038f3aa75e8654f78ebd6fa714b7e585531504e648588fd"},
   "ex_cldr_units": {:hex, :ex_cldr_units, "3.16.2", "dbad303fba819981c578234e2aaf19d72efca16ea8b1c6ee46b26232cb45e232", [:mix], [{:cldr_utils, "~> 2.24", [hex: :cldr_utils, repo: "hexpm", optional: false]}, {:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:ex_cldr_lists, "~> 2.10", [hex: :ex_cldr_lists, repo: "hexpm", optional: false]}, {:ex_cldr_numbers, "~> 2.31", [hex: :ex_cldr_numbers, repo: "hexpm", optional: false]}, {:ex_doc, "~> 0.18", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "851095319fb3205c1549619da742cd53a2804c1d9c204cf84014021e2a6ea7e5"},
-  "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"},
   "ex_json_schema": {:hex, :ex_json_schema, "0.10.1", "e03b746b6675a750c0bb1a5cc919f61353f7ab8450977e11ceede20e6180c560", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm", "66a64e60dadad89914d92f89c7e7906c57de75a8b79ac2480d0d53e1b8096fb0"},
   "ex_keccak": {:hex, :ex_keccak, "0.7.1", "0169f4b0c5073c5df61581d6282b12f1a1b764dcfcda4eeb1c819b5194c9ced0", [:mix], [{:rustler, ">= 0.0.0", [hex: :rustler, repo: "hexpm", optional: true]}, {:rustler_precompiled, "~> 0.6.1", [hex: :rustler_precompiled, repo: "hexpm", optional: false]}], "hexpm", "c18c19f66b6545b4b46b0c71c0cc0079de84e30b26365a92961e91697e8724ed"},
   "ex_machina": {:hex, :ex_machina, "2.7.0", "b792cc3127fd0680fecdb6299235b4727a4944a09ff0fa904cc639272cd92dc7", [:mix], [{:ecto, "~> 2.2 or ~> 3.0", [hex: :ecto, repo: "hexpm", optional: true]}, {:ecto_sql, "~> 3.0", [hex: :ecto_sql, repo: "hexpm", optional: true]}], "hexpm", "419aa7a39bde11894c87a615c4ecaa52d8f107bbdd81d810465186f783245bf8"},