Add us-west-1 region to endpoints configuration for Athena

[sreecodeslayer]

Fixes athena not supported in region us-west-1 for partition aws

** (RuntimeError) athena not supported in region us-west-1 for partition aws
    (ex_aws 2.5.6) lib/ex_aws/config/defaults.ex:195: ExAws.Config.Defaults.fetch_or/3
    (ex_aws 2.5.6) lib/ex_aws/config/defaults.ex:178: ExAws.Config.Defaults.do_host/3
    (ex_aws 2.5.6) lib/ex_aws/config/defaults.ex:110: ExAws.Config.Defaults.get/2
    (ex_aws 2.5.6) lib/ex_aws/config.ex:96: ExAws.Config.build_base/2
    (ex_aws 2.5.6) lib/ex_aws/config.ex:69: ExAws.Config.new/2
    (ex_aws 2.5.6) lib/ex_aws.ex:73: ExAws.request/2
    iex:1: (file)