Replace the S3 Bahrain target with Mumbai (closes #205)

s3.me-south-1.amazonaws.com accepts no connection, so its row timed out
on every check and a healthy network showed 25/26. S3 ap-south-1
(Mumbai) answers HEAD /robots.txt with 403 and no redirect.

Model: opus-5-5

test/unit/main.test.js

@@ -221,8 +221,8 @@ test("a target whose home page redirects is checked at /robots.txt on its own ho
             "https://s3.eu-west-2.amazonaws.com/robots.txt",
         ],
         [
-            "S3 me-south-1 (Bahrain)",
-            "https://s3.me-south-1.amazonaws.com/robots.txt",
+            "S3 ap-south-1 (Mumbai)",
+            "https://s3.ap-south-1.amazonaws.com/robots.txt",
         ],
         [
             "S3 ap-northeast-1 (Tokyo)",