Bump @aws-sdk/client-s3 to ^3.931.0

SDK versions 3.929.0-3.930.0 have a regression (aws/aws-sdk-js-v3#7500)
in REST protocol deserialization that causes empty XML responses to fail
with "Expected object, got string". This affects GetObjectAttributes
when no matching attributes are found (e.g. requesting non-existent user
metadata keys). Fixed in 3.931.0 by aws/aws-sdk-js-v3#7501.

Issue: CLDSRV-868

Author: maeldonn

package.json

@@ -20,7 +20,7 @@
   "homepage": "https://github.com/scality/S3#readme",
   "dependencies": {
     "@aws-sdk/client-iam": "^3.930.0",
-    "@aws-sdk/client-s3": "^3.908.0",
+    "@aws-sdk/client-s3": "^3.931.0",
     "@aws-sdk/client-sts": "^3.930.0",
     "@aws-sdk/credential-providers": "^3.864.0",
     "@aws-sdk/middleware-retry": "^3.374.0",