Upgrade aws-sdk-go

[sylr]

Upgrading the AWS SDK fixes a problem when using an AWS profile which uses SSO:

before:

$ AWS_PROFILE=xxxxxxx ec2-instance-selector --memory 16 --vcpus 4
An error occurred when filtering instance types: NoCredentialProviders: no valid providers in chain. Deprecated.
	For verbose messaging see aws.Config.CredentialsChainVerboseErrors%

after:

$ AWS_PROFILE=xxxxxxx ~/go/bin/ec2-instance-selector --memory 16 --vcpus 4
d3en.xlarge
g4dn.xlarge
m4.xlarge
m5.xlarge
m5a.xlarge
...

Profile looks like this:

[profile xxxxxxx]
region = eu-west-1
output = json
csm_enabled = true
sso_start_url = https://d-xxxxxx.awsapps.com/start
sso_region = eu-west-1
sso_account_id = yyyyyyyyyyy
sso_role_name = zzzzzzzzz

[bwagner5]

LGTM! thanks!