Don't pin rollup version

[jonatanklosko]

We currently point to a specific rollup version as a workaround for withastro/astro#7146.

livebook.dev/package.json

Lines 23 to 25 in ad6be91

	"overrides": {
	"rollup": "3.21.8"
	}

Opening an issue just so I remember to remove that once fixed (since JSON doesn't allow TODO comments :D).