Bump ex_doc from 0.28.5 to 0.28.6

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.28.5 to 0.28.6.
- [Release notes](https://github.com/elixir-lang/ex_doc/releases)
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/main/CHANGELOG.md)
- [Commits](https://github.com/elixir-lang/ex_doc/compare/v0.28.5...v0.28.6)

---
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

@@ -46,7 +46,7 @@
   "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, "2.27.3", "d6c1f1fb27ada01a77a7e0cf4ef0c59ad122a23829b6fd601820ac783d1bc9a5", [: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, "~> 2.28", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_cldr_currencies, "~> 2.14", [hex: :ex_cldr_currencies, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "2550dccc5232b90507e78a9fdee49d453249681e85d874f7d6703059be426724"},
   "ex_cldr_units": {:hex, :ex_cldr_units, "3.14.0", "1a86dc28689987ae06dc69f47803f5f6d59a01c8fbb4117c06fd6f7ca58b3d95", [:mix], [{: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, "~> 2.26", [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]}, {:ratio, "~> 2.4", [hex: :ratio, repo: "hexpm", optional: false]}], "hexpm", "07d72e97f40d9af2d6802cebc50fe045afdb57f42dda4da2ec20da754358f9e3"},
-  "ex_doc": {:hex, :ex_doc, "0.28.5", "3e52a6d2130ce74d096859e477b97080c156d0926701c13870a4e1f752363279", [:mix], [{:earmark_parser, "~> 1.4.19", [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", "d2c4b07133113e9aa3e9ba27efb9088ba900e9e51caa383919676afdf09ab181"},
+  "ex_doc": {:hex, :ex_doc, "0.28.6", "2bbd7a143d3014fc26de9056793e97600ae8978af2ced82c2575f130b7c0d7d7", [:mix], [{:earmark_parser, "~> 1.4.19", [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", "bca1441614654710ba37a0e173079273d619f9160cbcc8cd04e6bd59f1ad0e29"},
   "ex_json_schema": {:hex, :ex_json_schema, "0.9.2", "c9a42e04e70cd70eb11a8903a22e8ec344df16edef4cb8e6ec84ed0caffc9f0f", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm", "4854329cb352b6c01c4c4b8dbfb3be14dc5bea19ea13e0eafade4ff22ba55224"},
   "ex_keccak": {:hex, :ex_keccak, "0.6.0", "0e1f8974dd6630dd4fb0b64f9eabbceeffb9675da3ab95dea653798365802cf4", [:mix], [{:rustler, "~> 0.26", [hex: :rustler, repo: "hexpm", optional: false]}], "hexpm", "84b20cfe6a063edab311b2c8ff8b221698c84cbd5fbdba059e51636540142538"},
   "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"},