Build(deps): bump govspeak from 10.8.5 to 10.8.6

Bumps [govspeak](https://github.com/alphagov/govspeak) from 10.8.5 to 10.8.6.
- [Changelog](https://github.com/alphagov/govspeak/blob/main/CHANGELOG.md)
- [Commits](alphagov/govspeak@v10.8.5...v10.8.6)

---
updated-dependencies:
- dependency-name: govspeak
  dependency-version: 10.8.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -172,7 +172,7 @@ GEM
       rake (>= 13)
     googleapis-common-protos-types (1.22.0)
       google-protobuf (~> 4.26)
-    govspeak (10.8.5)
+    govspeak (10.8.6)
       actionview (>= 6, < 8.1.2)
       addressable (>= 2.3.8, < 2.8.9)
       govuk_publishing_components (>= 43)