Add new AWS Region, eu-south-2

[ewbankkit]

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Closes #336.

% go test ./...
ok  	github.com/hashicorp/aws-sdk-go-base/v2	1.712s
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/awsconfig	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/config	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/constants	[no test files]
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/endpoints	0.775s
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/expand	(cached)
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/test	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/mockdata	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/servicemocks	[no test files]
ok  	github.com/hashicorp/aws-sdk-go-base/v2/useragent	(cached)

[jar-b]

LGTM

$ go test -count=1 ./...
ok      github.com/hashicorp/aws-sdk-go-base/v2 0.994s
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/awsconfig      [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/config [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/constants      [no test files]
ok      github.com/hashicorp/aws-sdk-go-base/v2/internal/endpoints      0.135s
ok      github.com/hashicorp/aws-sdk-go-base/v2/internal/expand 0.201s
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/test   [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/mockdata        [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/servicemocks    [no test files]
ok      github.com/hashicorp/aws-sdk-go-base/v2/useragent       0.295s