fix: link in microcks-1.2.0-release.md.

[e-esakman]

Description

• Fixes broken markdown links in the Microcks 1.2.0 release blog post by removing extra '[' before URLs and updating Twitter to X.
• closes Fix 404 links reported by Google Analytics in blog post https://microcks.io/blog/microcks-1.2.0-release/ #479

Related issue(s)

[yada]

LGTM with thanks

[github-actions]

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