build: use caret for specifying node version to avoid major upgrades automatically

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Additionally, vercel was also warning about using >=18.0.0 for node version so that would also be gone with this.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
excalidraw	✅ Ready (Inspect)	Visit Preview	Nov 16, 2023 10:39am
excalidraw-package-example	✅ Ready (Inspect)	Visit Preview	Nov 16, 2023 10:39am

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
docs	⬜️ Ignored (Inspect)		Nov 16, 2023 10:39am

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	73.61% / 70%	44821 / 60888
🟢	Statements	73.61% / 70%	44821 / 60888
🟢	Functions	69.83% / 68%	1431 / 2049
🟢	Branches	81.08% / 70%	5636 / 6951

File Coverage

No changed files found.

Generated in workflow #1063

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
dist/excalidraw.production.min.js	314.63 KB (0%)	6.3 s (0%)	1.1 s (+1.57% 🔺)	7.3 s
dist/excalidraw-assets/locales	280.73 KB (0%)	5.7 s (0%)	170 ms (-19.82% 🔽)	5.8 s
dist/excalidraw-assets/vendor*.js	826.02 KB (0%)	16.6 s (0%)	2.1 s (+0.01% 🔺)	18.6 s