extension: update gopls v0.21.0 settings

This is an automated CL which updates the gopls version and settings.

For golang/go#76367

Change-Id: I75f1475bf1cef67589af8ca378f663c4f5c86dd1
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/729661
Auto-Submit: Gopher Robot <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Alan Donovan <[email protected]>
Reviewed-by: Madeline Kalil <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
Commit-Queue: Alan Donovan <[email protected]>

Author: gopherbot

extension/src/goToolsInformation.ts

@@ -146,8 +146,8 @@ const internal = new Map<string, Tool>([
 			description: 'Language Server from Google',
 			usePrereleaseInPreviewMode: true,
 			minimumGoVersion: semver.coerce('1.19'),
-			latestVersion: semver.parse('v0.20.0'),
-			latestVersionTimestamp: moment('2025-07-28', 'YYYY-MM-DD')
+			latestVersion: semver.parse('v0.21.0'),
+			latestVersionTimestamp: moment('2025-12-05', 'YYYY-MM-DD')
 		}
 	],
 	[