Update repository for Astro 4.0

[lilnasy]

Changes

• Mostly around testing.
• The package.json for astro-global now includes semver range for Astro 4.x

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9de3d0ffdf8a3478b1eedbec82034d3b2ccbe7f6

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR