packer build amazon-instance Error talking to S3

_This issue was originally opened by @PAKalucki in https://github.com/hashicorp/packer/issues/11887 and has been migrated to this repository. The original issue description is below._

---
#### Overview of the Issue
Packer build of amazon-instance fails on upload with:

instance_ami.amazon-instance.ubuntu: ERROR: Error talking to S3: Server.InvalidRequest(400): The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.

#### Reproduction Steps

Run packer build with template below, with ubuntu 20.04 focal source_ami

### Packer version

1.8.2

### Simplified Packer Template

```
packer {
required_plugins {
amazon = {
source = "github.com/hashicorp/amazon"
version = ">= 1.1.1"
}
}
}

source "amazon-instance" "ubuntu" {
ami_name = "instance_ami"
instance_type = "t2.micro"
region = "eu-central-1"
source_ami = "ami"
account_id = "xxx"
s3_bucket = "bucket"
x509_cert_path = "certificate.pem"
x509_key_path = "private-key.pem"
ssh_username = "ubuntu"
bundle_upload_command = "sudo -i -n ec2-upload-bundle -b {{.BucketName}} -m {{.ManifestPath}} -a {{.AccessKey}} -s {{.SecretKey}} -d {{.BundleDirectory}} --location {{.Region}} --batch --retry"

temporary_iam_instance_profile_policy_document {
Version = "2012-10-17"
Statement {
Effect = "Allow"
Action = [
"s3:PutObject",
"s3:GetObject",
"s3:ListBucket",
"s3:GetBucketLocation",
"s3:PutObjectAcl"
]
Resource = ["*"]
}
}
}

build {
name = "instance_ami"
sources = [
"source.amazon-instance.ubuntu"
]

provisioner "shell" {
inline = ["sudo apt-get update -y && sudo apt-get install ec2-ami-tools"]
}
}

```

### Log Fragments and crash.log files

```
==> instance_ami.amazon-instance.ubuntu: Uploading the bundle...
==> instance_ami.amazon-instance.ubuntu: ERROR: Error talking to S3: Server.InvalidRequest(400): The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.
==> instance_ami.amazon-instance.ubuntu: Please check that the bucket `bucket` does not exist, or exists and is writable. This error indicates that the bucket may be owned by somebody else.
==> instance_ami.amazon-instance.ubuntu: Bundle upload failed. Please see the output above for more
==> instance_ami.amazon-instance.ubuntu: details on what went wrong.
==> instance_ami.amazon-instance.ubuntu: Provisioning step had errors: Running the cleanup provisioner, if present...
==> instance_ami.amazon-instance.ubuntu: Terminating the source AWS instance...
==> instance_ami.amazon-instance.ubuntu: Detaching temporary role from instance profile...
==> instance_ami.amazon-instance.ubuntu: Removing policy from temporary role...
==> instance_ami.amazon-instance.ubuntu: Deleting temporary role...
==> instance_ami.amazon-instance.ubuntu: Deleting temporary instance profile...
==> instance_ami.amazon-instance.ubuntu: Deleting temporary security group...
==> instance_ami.amazon-instance.ubuntu: Deleting temporary keypair...
Build 'instance_ami.amazon-instance.ubuntu' errored after 7 minutes 52 seconds: Bundle upload failed. Please see the output above for more
details on what went wrong.

==> Wait completed after 7 minutes 52 seconds

==> Some builds didn't complete successfully and had errors:
--> instance_ami.amazon-instance.ubuntu: Bundle upload failed. Please see the output above for more
details on what went wrong.

==> Builds finished but no artifacts were created.
```