Bump govspeak from 8.5.1 to 8.6.0

[dependabot[bot]]

Bumps govspeak from 8.5.1 to 8.6.0.

Changelog

Sourced from govspeak's changelog.

8.6.0

• Remove embed functionality (#358)

Commits

• e94331a Merge pull request #358 from alphagov/remove-embed-functionality
• d651f39 Bump version
• 4717d84 Remove ContentBlock related functionality
• See full diff in compare view

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