chore: fix slack notification message tag

[amagyar-iohk]

Overview

Fixes tag link on release notification message

Checklists

Pre-submit checklist:

• Self-reviewed the diff
• New code has proper comments/documentation/tests
• Any changes not covered by tests have been tested manually
• The README files are updated
• If new libraries are included, they have licenses compatible with our project
• If there is a db migration altering existing tables, there is a proper migration test

Pre-merge checklist:

• Commits have useful messages
• Review clarifications made it into the code

[github-actions]

Unit Test Results

289 tests  ±0   288 ✔️ ±0   23s ⏱️ -2s
  36 suites ±0       1 💤 ±0 
  36 files   ±0       0 ❌ ±0 

Results for commit 9b89a01. ± Comparison against base commit 3d75ce9.

[atala-dev]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors
✅ JSON	jsonlint	1		0
✅ JSON	npm-package-json-lint	yes		no
✅ JSON	prettier	1		0
✅ JSON	v8r	1		0
✅ REPOSITORY	dustilock	yes		no
✅ REPOSITORY	git_diff	yes		no
✅ REPOSITORY	grype	yes		no
⚠️ REPOSITORY	kics	yes		50
✅ REPOSITORY	syft	yes		no
✅ REPOSITORY	trivy-sbom	yes		no
⚠️ REPOSITORY	trufflehog	yes		1

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[mkbreuningIOHK]

The changes are fixing the message with wrong link issue, so this is approved.
But I left a comment to discuss further and more sustainable solution.