Bump ex_doc from 0.30.7 to 0.30.8 (#507)

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.30.7 to 0.30.8.
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/main/CHANGELOG.md)
- [Commits](elixir-lang/ex_doc@v0.30.7...v0.30.8)

---
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

@@ -31,7 +31,7 @@
   "ex_cldr_dates_times": {:hex, :ex_cldr_dates_times, "2.14.3", "5f2f81b7de19d565037240ba07f5cc6f9adb14ef6345f2ccc0937a72d9a5e9f8", [:mix], [{:calendar_interval, "~> 0.2", [hex: :calendar_interval, repo: "hexpm", optional: true]}, {:ex_cldr_calendars, "~> 1.22", [hex: :ex_cldr_calendars, repo: "hexpm", optional: false]}, {:ex_cldr_numbers, "~> 2.31", [hex: :ex_cldr_numbers, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:tz, "~> 0.26", [hex: :tz, repo: "hexpm", optional: true]}], "hexpm", "00e6227bb6e43699d005acd3b37ebcd12643eff937cac9def0c4efbcc840c61c"},
   "ex_cldr_numbers": {:hex, :ex_cldr_numbers, "2.32.2", "5e0e3031d3f54b51fe7078a7a94592987b70b06d631bdc88813b222dc5a8b1bd", [: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", "91257684a9c4d6abdf738f0cc5671837de876e69552e8bd4bc5fa1bfd5817713"},
   "ex_cldr_plugs": {:hex, :ex_cldr_plugs, "1.3.0", "72a2064cb36c390dd0b212e8a172f643d455c8d362ee9c4bda29a96b42204df6", [:mix], [{:ex_cldr, "~> 2.37", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:gettext, "~> 0.19", [hex: :gettext, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "699a98543ea14a7c849fae768041c40f49aa611aa55866025d227796e4858bff"},
-  "ex_doc": {:hex, :ex_doc, "0.30.7", "dc7247091aec738ab781f71cbebfc07979d1040c98c7ee67dbde99b7829b743d", [: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", "868ff1c7a44c462741853840d1e7ef19a07906e7467cb8da070c158ea6a42a51"},
+  "ex_doc": {:hex, :ex_doc, "0.30.8", "cf3eb2eb32137966aab0929bb3af42773b2d08e2f785a5fee9caabf664082cb3", [: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", "bfb981d8e0a8ab23857e502d611c612ae2c24536dd3b530e741d1d94ea44e6e2"},
   "excoveralls": {:hex, :excoveralls, "0.18.0", "b92497e69465dc51bc37a6422226ee690ab437e4c06877e836f1c18daeb35da9", [:mix], [{:castore, "~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "1109bb911f3cb583401760be49c02cbbd16aed66ea9509fc5479335d284da60b"},
   "expo": {:hex, :expo, "0.4.1", "1c61d18a5df197dfda38861673d392e642649a9cef7694d2f97a587b2cfb319b", [:mix], [], "hexpm", "2ff7ba7a798c8c543c12550fa0e2cbc81b95d4974c65855d8d15ba7b37a1ce47"},
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},