chore: Test WP versions 6.3 and 6.4. Drop 6.2.

[mindctrl]

Description

Updates GitHub Actions to test WP 6.4 and drops 6.2.

Testing

Automated test-plugin tests should continue to pass.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 48160c8

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

📦 Next.js Bundle Analysis for @faustwp/getting-started-example

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This PR introduced no changes to the JavaScript bundle! 🙌