Add support for nightly version of Relay

[tillkruss]

---

name: ⚙ Improvement
about: You found a bug, want to improve something or add a new feature
labels: enhancement

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Related discussion: N/A

Further notes in Contribution Guidelines
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Description

Add support for nightly versions of Relay, which would be helpful while maintaining Predis.

In case this PR introduced TypeScript/JavaScript code changes:

• I have written test cases for the changes in this pull request
• I have run npm run format before the commit.
• I have run npm run lint before the commit.
• I have run npm run release before the commit.
• npm test returns with no unit test errors and all code covered.

In case this PR edits any scripts:

• I have checked the edited scripts for syntax.
• I have tested the changes in an integration test (If yes, provide workflow YAML and link).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f210bb3) to head (185b391).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #1012   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          822       822           
  Branches       288       288           
=========================================
  Hits           822       822           

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