Bump govuk_markdown from 2.0.3 to 2.0.4

Bumps [govuk_markdown](https://github.com/DFE-Digital/govuk_markdown) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/DFE-Digital/govuk_markdown/releases)
- [Changelog](https://github.com/DFE-Digital/govuk-markdown/blob/main/CHANGELOG.md)
- [Commits](DFE-Digital/govuk-markdown@v2.0.3...v2.0.4)

---
updated-dependencies:
- dependency-name: govuk_markdown
  dependency-version: 2.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -386,7 +386,7 @@ GEM
       activemodel (>= 6.1)
       activesupport (>= 6.1)
       html-attributes-utils (~> 1)
-    govuk_markdown (2.0.3)
+    govuk_markdown (2.0.4)
       activesupport
       redcarpet
     haml (7.1.0)