3583 [url_launcher] Fix SDK copypasta in platform interface (cla: yes, nnbd, p: url_launcher)

3584 [url_launcher] Update platforms to NNBD stable (cla: yes, nnbd, p: url_launcher, platform-linux, platform-macos, platform-web, platform-windows)

3585 [connectivity_platform_interface] nnbd stable release (cla: yes, nnbd, p: connectivity, waiting for tree to go green)

3586 [shared_preferences] Bump version for NNBD stable (cla: yes, nnbd, p: shared_preferences)

3587 [battery] Bump platform version to NNBD stable (cla: yes, nnbd, p: battery)