update the sdk lower bound to the current stable

[devoncarew]

• update the sdk lower bound to the current stable

We can use stable as the current lower bound - instead of 3.6.0-0 (dev) - now that stable is out.

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:lints	5.1.1	ready to publish	v5.1.1

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[goderbauer]

LGTM

[pq]

👍