Pin AWS SDK version in lambda layer sample app to fix build (#257)

*Issue #, if available:*
Fix failing build:
https://github.com/aws-observability/aws-otel-js-instrumentation/actions/runs/17474640162

*Description of changes:*
Pin AWS SDK version in lambda layer sample app

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Author: jj22ee

lambda-layer/sample-apps/aws-sdk/package.json

@@ -51,6 +51,6 @@
     "typescript": "4.9.5"
   },
   "dependencies": {
-    "@aws-sdk/client-s3": "^3.651.1"
+    "@aws-sdk/client-s3": "3.651.1"
   }
 }