chore(cli): remove deprecated AWS SDK v3 utilities in favor of Smithy equivalents (#852)

Removes left-over, long deprecated AWS SDK v3 utility packages. We are
already using the Smithy equivalents:

- Removes `@aws-sdk/middleware-endpoint` in favor of
`@smithy/middleware-endpoint`
- Removes `@aws-sdk/util-retry` in favor of `@smithy/util-retry`  
- Removes `@aws-sdk/util-waiter` in favor of `@smithy/util-waiter`

This change aligns with AWS SDK v3's migration path where utility
functions have been moved to the Smithy protocol layer. The
functionality remains the same as we were already using the newer,
non-deprecated packages.

---
By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache-2.0 license

Author: mrgrain

.projenrc.ts

@@ -1144,12 +1144,9 @@ const cli = configureProject(
       '@aws-sdk/credential-providers',
       '@aws-sdk/ec2-metadata-service',
       '@aws-sdk/lib-storage',
-      '@aws-sdk/middleware-endpoint',
-      '@aws-sdk/util-retry',
-      '@aws-sdk/util-waiter',
       '@smithy/middleware-endpoint',
-      '@smithy/shared-ini-file-loader',
       '@smithy/property-provider',
+      '@smithy/shared-ini-file-loader',
       '@smithy/types',
       '@smithy/util-retry',
       '@smithy/util-waiter',