docs: fix missing https scheme in hub.microcks.io link

[rissh]

Description

• Fixed broken link to hub.microcks.io in Microcks 1.5.2 release blog post
• Added missing https:// scheme to make it an external link:
  • Old: [hub.microcks.io](hub.microcks.io) (relative link - 404)
  • New: [hub.microcks.io](https://hub.microcks.io) (external link - working)

Related issue(s)

Fixes #489

[yada]

LGTM with thanks

[github-actions]

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