chore: Update the test for keystore format

Author: M. Emin Cihangeri

packages/connectivity/src/http-agent/http-agent.spec.ts

@@ -230,7 +230,7 @@ describe('createAgent', () => {
     };
 
     expect(async () => getAgentConfig(destination)).rejects.toThrow(
-      "The format of the provided certificate 'cert.unknown' is not supported. Supported formats are: p12, pfx, pem, jks."
+      "The format of the provided certificate 'cert.unknown' is not supported. Supported formats are: p12, pfx, pem, jks, keystore."
     );
   });