chore: lock s3 version and disable automerge

Author: tripodsan

.renovaterc.json

@@ -1,3 +1,17 @@
 {
-  "extends": ["github>adobe/helix-shared"]
+  "extends": [
+    "github>adobe/helix-shared"
+  ],
+  "packageRules": [
+    {
+      "matchPackageNames": ["*"],
+      "automerge": false
+    },
+    {
+      "matchPackageNames": [
+        "@aws-sdk/client-s3"
+      ],
+      "allowedVersions": "3.726.1"
+    }
+  ]
 }