Align branch config with the mainless release model

[lorisleiva]

This PR aligns the branch's configuration with the mainless release model defined in RELEASING.md: .changeset/config.json now declares this branch as its own baseBranch, and the workflow triggers drop the no-longer-existing main branch.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6605a3e

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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[lorisleiva]

• Align branch config with the mainless release model #1115 👈 (View in Graphite)
• 1.x

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