Upgrade aws-sdk-go-v2

Created by: eseliger

This PR:

• Migrates to the AWS v2 API in the codeintel s3 adapter
• Upgrades the v2 package to the newest version

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 28c81089e862636455b6c46e61b49a2c588a5a31...7c20ffbb560086f3b795e839ba787ff7e6a3b141.

Notify	File(s)
@LawnGnome	internal/extsvc/awscodecommit/client.go internal/extsvc/awscodecommit/codehost.go internal/extsvc/awscodecommit/repos.go
@beyang	enterprise/cmd/precise-code-intel-worker/main.go
@christinaforney	doc/dependency_decisions.yml
@efritz	enterprise/cmd/precise-code-intel-worker/main.go enterprise/internal/codeintel/stores/uploadstore/config_test.go enterprise/internal/codeintel/stores/uploadstore/mock_s3_api_test.go enterprise/internal/codeintel/stores/uploadstore/s3_api.go enterprise/internal/codeintel/stores/uploadstore/s3_client.go enterprise/internal/codeintel/stores/uploadstore/s3_client_test.go

Created by: efritz

This may be a MinIO issue (filed here if so), or it could be an issue with the new Go SDK version that just happens to make invalid requests in a way that S3 leniently accepts.

If MinIO claims it to be an issue with S3 we can follow up in another way.

Created by: efritz

Fixes #19729 (closed).