Bump ex_doc from 0.25.2 to 0.25.3

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.25.2 to 0.25.3.
- [Release notes](https://github.com/elixir-lang/ex_doc/releases)
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/master/CHANGELOG.md)
- [Commits](elixir-lang/ex_doc@v0.25.2...v0.25.3)

---
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

@@ -6,7 +6,7 @@
   "earmark": {:hex, :earmark, "1.4.8", "a7d0b2a02d52ffd5ca73106f36cd7f7db333ded41c756f1f1407adadbeef9bb7", [:mix], [{:earmark_parser, ">= 1.4.9", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "138d6a1de01e14e33c6762a245829d7d413d63b6d49d55c0232bbc6a561127ba"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.15", "b29e8e729f4aa4a00436580dcc2c9c5c51890613457c193cc8525c388ccb2f06", [:mix], [], "hexpm", "044523d6438ea19c1b8ec877ec221b008661d3c27e3b848f4c879f500421ca5c"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
-  "ex_doc": {:hex, :ex_doc, "0.25.2", "4f1cae793c4d132e06674b282f1d9ea3bf409bcca027ddb2fe177c4eed6a253f", [:mix], [{:earmark_parser, "~> 1.4.0", [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", "5b0c172e87ac27f14dfd152d52a145238ec71a95efbf29849550278c58a393d6"},
+  "ex_doc": {:hex, :ex_doc, "0.25.3", "3edf6a0d70a39d2eafde030b8895501b1c93692effcbd21347296c18e47618ce", [:mix], [{:earmark_parser, "~> 1.4.0", [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", "9ebebc2169ec732a38e9e779fd0418c9189b3ca93f4a676c961be6c1527913f5"},
   "excoveralls": {:hex, :excoveralls, "0.14.2", "f9f5fd0004d7bbeaa28ea9606251bb643c313c3d60710bad1f5809c845b748f0", [:mix], [{:hackney, "~> 1.16", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "ca6fd358621cb4d29311b29d4732c4d47dac70e622850979bc54ed9a3e50f3e1"},
   "hackney": {:hex, :hackney, "1.17.4", "99da4674592504d3fb0cfef0db84c3ba02b4508bae2dff8c0108baa0d6e0977c", [:rebar3], [{:certifi, "~>2.6.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~>6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~>1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~>1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "de16ff4996556c8548d512f4dbe22dd58a587bf3332e7fd362430a7ef3986b16"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},