chore(ci): upgrade pnpm setup to use node20

[sjelfull]

Description

This upgrades pnpm/action-setup@v2 that uses Node 16 to v4 that uses Node 20. This gets rid of the deprecation warnings in GH actions. This version is also more strict and requires you to install the exact version if you have defined packageManager in package.json.

What to review

Any downsides to upgrading? I know we do tests against Node 18 as well, but don't think this affects that in any way?

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
page-building-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2024 8:58pm
performance-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2024 8:58pm
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test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2024 8:58pm

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)	Visit Preview		Jun 19, 2024 8:58pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Jun 19, 2024 9:07 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	37s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	7s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	27s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	32s	11	7	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	15s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	52s	1	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	36s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 14s	20	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 5s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	7s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	21s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	15s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	30s	12	0	0