fixup on failing tests

Author: benzekrimaha

lib/auth/v4/createCanonicalRequest.ts

@@ -74,13 +74,7 @@ export default function createCanonicalRequest(
     const canonicalHeadersList = signedHeadersList.map((signedHeader: any) => {
         if (pHeaders[signedHeader] !== undefined) {
             const headerValue = pHeaders[signedHeader];
-            // AWS SDK v3 can pass header values as arrays (for multiple values),
-            // strings, or other types. We need to normalize them before calling .trim()
-            // Per HTTP spec and AWS Signature v4, multiple values are joined with commas
-            const stringValue = Array.isArray(headerValue) 
-                ? headerValue.join(',') 
-                : String(headerValue);
-            const trimmedHeader = stringValue
+           const trimmedHeader = pHeaders[signedHeader]
                 .trim().replace(/\s+/g, ' ');
             return `${signedHeader}:${trimmedHeader}\n`;
         }