Update open-v3-pr.ts

Author: penalosa

tools/deployments/open-v3-pr.ts

@@ -17,7 +17,7 @@ if (require.main === module) {
 		try {
 			// Open PR
 			execSync(
-				`gh pr create --base main --head v3-maintenance-${process.env.PR_NUMBER} --label "skip-pr-description-validation" --label "skip-v3-pr" --title "Backport #${process.env.PR_NUMBER} to Wrangler v3" --body "This is an automatically opened PR to backport patch changes from #${process.env.PR_NUMBER} to Wrangler v3"`
+				`gh pr create --base v2-maintenance --head v3-maintenance-${process.env.PR_NUMBER} --label "skip-pr-description-validation" --label "skip-v3-pr" --title "Backport #${process.env.PR_NUMBER} to Wrangler v3" --body "This is an automatically opened PR to backport patch changes from #${process.env.PR_NUMBER} to Wrangler v3"`
 			);
 		} catch {
 			// Ignore "PR already created failures"