chore: fix publishing workflow pt 2

[ava-silver]

What does this PR do?

Fixes the issue previously encountered when publishing: https://github.com/DataDog/serverless-plugin-datadog/actions/runs/21411949889/job/61650870247

This is due to us having to migrate from yarn 1.x to yarn 4.x

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[ava-silver]

• chore: fix publishing workflow pt 2 #659 👈 (View in Graphite)
• main

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