chore: fix yarn version in cf deploy script

[mpetrunic]

Description

Related Issue Or Context

Closes: #

How Has This Been Tested? Testing details.

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)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in sygma-docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	1875cea
Status:	✅  Deploy successful!
Preview URL:	https://6eca1939.sygma-widget.pages.dev
Branch Preview URL:	https://fix-cf-yarn-version.sygma-widget.pages.dev

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