aws: migrate code to Go SDK v2

[mauri870]

AWS announced the end of support for the Go SDK v1 on July 31, 2025. From now on it will receive only critical security updates and when the deadline is reached there will be no more updates (security or otherwise) to the v1 SDK.

I know it's a long time from now, but I wanted to create this ticket so that we can plan in advance.

My preliminary investigation indicates that we only need to upgrade S3 code, which is contained in the aws directory:

$ rg github.com/aws/aws-sdk-go ./**/*.go
./aws/s3_test.go
12:     "github.com/aws/aws-sdk-go/aws"
13:     "github.com/aws/aws-sdk-go/service/s3"
14:     "github.com/aws/aws-sdk-go/service/s3/s3manager"

./aws/s3.go
10:     "github.com/aws/aws-sdk-go/aws"
11:     "github.com/aws/aws-sdk-go/aws/credentials"
12:     "github.com/aws/aws-sdk-go/aws/session"
13:     "github.com/aws/aws-sdk-go/service/s3"
14:     "github.com/aws/aws-sdk-go/service/s3/s3manager"

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SDK v2 documentation for reference
AWS docs