chore(deps): update pnpm/action-setup action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pnpm/action-setup	action	major	v2 -> v4

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Release Notes

pnpm/action-setup (pnpm/action-setup)

v4

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Configuration

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[bjerk-bot]

🍹 preview on bjerk-bot/bjerk/prod

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Previewing update (bjerk/prod)

View Live: https://app.pulumi.com/bjerk/bjerk-bot/prod/previews/8d3411ae-2e7f-4aed-92ec-8897a5a0c246

@ Previewing update....
Downloading plugin github-5.26.0: starting
Downloading plugin github-5.26.0: done
Installing plugin github-5.26.0: starting
@ Previewing update....
Installing plugin github-5.26.0: done

pulumi:pulumi:Stack bjerk-bot-prod running 
@ Previewing update.....
pulumi:pulumi:Stack bjerk-bot-prod  
Resources:
8 unchanged