standardize on @aws-sdk v3 versions for test stability

Signed-off-by: Andrew Ochsner <andrew.ochsner@cognizant.com>

plugins/kubernetes-backend/package.json

@@ -70,7 +70,6 @@
     "@kubernetes/client-node": "0.18.1",
     "@types/express": "^4.17.6",
     "@types/luxon": "^3.0.0",
-    "aws4": "^1.11.0",
     "compression": "^1.7.4",
     "cors": "^2.8.5",
     "express": "^4.17.1",