feat: upgrade aws-sdk-go to fix SSO issue

[paulojmdias]

Upgrading aws-sdk-go to fix the issue with usage with SSO.

Tested with the following configuration:

[profile dummy]
sso_session = dummy
sso_account_id = REDACTED
sso_role_name = dummy-role
region = us-east-1
output = json

[sso-session dummy]
sso_start_url = https://d-REDACTED.awsapps.com/start#
sso_region = us-east-1
sso_registration_scopes = sso:account:access

Closes #350

[paulojmdias]

@nywilken sorry for ping you, but can you please review it? 🙏

[nywilken]

@paulojmdias thanks for the ping and my apologies for the delayed review. Our focus has been on Packer core these past few weeks. This looks good to me. Thank you for making the fix.

I'll pull this down to run some quick testing before merging.