fix: mkrelease finds CHANGELOG.md from repo root regardless of working directory

[github-actions]

Description

This update modifies the mkrelease script to ensure it correctly locates the CHANGELOG.md file from the repository root, regardless of the current working directory. This change improves the script's reliability and usability, addressing issues where users might run the script from different locations within the project structure.

How Has This Been Tested

• All unit tests pass.
• All integration tests pass.
• Manual Testing:

Types of changes

• Docs change
• Refactoring
• Dependency upgrade
• Additional Unit Tests\Integration Tests
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Removed no-longer used code

Deployment Configuration Changes

• Requires deployment configuration changes as specified below and in CHANGELOG.md

Checklist

• I have added tests to cover my changes.
• Unreleased section of CHANGELOG.md has been updated with details of this PR.

[credfeto]

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