fix: make gh-r release version search case-insensitive

[vladdoster]

Description

Make grep search case-insensitive requirement when using the gh-r ice.

before

after

Related Issue(s)

Closes #476

Types of changes

• 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)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.