Add predis/predis as dependency

[arunshenoy99]

Proposed changes

Predis is added as a fallback Redis client dependency for the object-cache drop-in, alongside the existing Credis dependency. In production we expect the phpredis extension to be installed, so this code path should not be used there.

Adding Predis ensures we can fail gracefully (e.g. fall back to Predis or Credis) if phpredis is missing or broken, rather than hard-failing.

Type of Change

Production

• Bugfix (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 not work as expected)
• Dependency update
• Refactoring / housekeeping (changes to files not directly related to functionality)

Development

• Tests
• Dependency update
• Environment update / refactoring
• Documentation Update

Visual

Checklist

• I have read the CONTRIBUTING doc
• I have viewed my change in a web-browser
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[github-actions]

Coverage: Base 6.30% → PR 6.66% (must not decrease).
✅ No decrease.

project coverage report 6.66% @ c22fbac