fix(deps): add @aws-sdk/middleware-sdk-rds in DocDB and Neptune (#2042)

Author: trivikr

clients/client-docdb/package.json

@@ -38,6 +38,7 @@
     "@aws-sdk/middleware-host-header": "3.5.0",
     "@aws-sdk/middleware-logger": "3.5.0",
     "@aws-sdk/middleware-retry": "3.5.0",
+    "@aws-sdk/middleware-sdk-rds": "3.5.0",
     "@aws-sdk/middleware-serde": "3.4.1",
     "@aws-sdk/middleware-signing": "3.5.0",
     "@aws-sdk/middleware-stack": "3.4.1",

clients/client-neptune/package.json

@@ -38,6 +38,7 @@
     "@aws-sdk/middleware-host-header": "3.5.0",
     "@aws-sdk/middleware-logger": "3.5.0",
     "@aws-sdk/middleware-retry": "3.5.0",
+    "@aws-sdk/middleware-sdk-rds": "3.5.0",
     "@aws-sdk/middleware-serde": "3.4.1",
     "@aws-sdk/middleware-signing": "3.5.0",
     "@aws-sdk/middleware-stack": "3.4.1",