Remove unused AWS SDK for JavaScript v2

[trivikr]

Issue

From AWS SDK for JavaScript v2 README:

We are formalizing our plans to make the Maintenance Announcement (Phase 2) for AWS SDK for JavaScript v2 in 2023.

I discovered osrm-backend while searching for popular projects on GitHub which use AWS SDK for JavaScript v2. On quick look, it appears like the aws-sdk dependency is not needed. It was added in commit https://github.com/Project-OSRM/osrm-backend/commit/2351b5a0840c39e31f31d0069dda6f8a4605f9dc

Tasklist

• [ ] CHANGELOG.md entry (How to write a changelog entry)
• [ ] update relevant Wiki pages
• [ ] add tests (see testing documentation)
• [ ] review
• [ ] adjust for comments
• [ ] cherry pick to release branch

Requirements / Relations

N/A

[trivikr]

cc active contributors @danpat @mjjbell

[mjjbell]

Yes I believe the AWS SDK is no longer needed after #6030