specify region_name for boto client #697

Job	Run time
Caching (3.8)	9s
Caching (3.9)	16s
Caching (3.10)	7s
Caching (3.11)	11s
Caching (3.12)	11s
Caching (3.13)	14s
Linting (3.8)	3m 36s
Linting (3.9)	3m 43s
Linting (3.10)	3m 10s
Linting (3.11)	2m 49s
Linting (3.12)	2m 53s
Linting (3.13)	2m 53s
dotnettest / test	1m 25s
javatest / test	1m 14s
jstest / test	1m 6s
terraformexamplestest / Find Jobs	5s
rubytest / test (3.3)	1m 5s
test / test (3.8)	17m 35s
testserver / test (3.8)	18m 23s
test / test (3.9)	16m 46s
testserver / test (3.9)	16m 51s
test / test (3.10)	15m 53s
testserver / test (3.10)	17m 27s
test / test (3.11)	15m 27s
testserver / test (3.11)	15m 27s
testproxy / test (ubuntu-latest, 3.10)	4m 27s
test / test (3.12)	16m 34s
testproxy / test (ubuntu-latest, 3.11)	4m 11s
testserver / test (3.12)	17m 49s
test / test (3.13)	16m 56s
testproxy / test (ubuntu-latest, 3.12)	4m 11s
testproxy / test (windows-latest, 3.10)	6m 9s
testproxy / test (windows-latest, 3.11)	5m 5s
testproxy / test (windows-latest, 3.12)	5m 42s
terraformexamplestest / test (acm)	4m 36s
terraformexamplestest / test (autoscaling)	2m 42s
terraformexamplestest / test (awslambda)	3m 46s
terraformexamplestest / test (cloudfront)	3m 48s
terraformexamplestest / test (codebuild)	2m 33s
terraformexamplestest / test (ds)	3m 45s
terraformexamplestest / test (ec2)	3m 6s
terraformexamplestest / test (elb)	3m 37s
terraformexamplestest / test (iam)	2m 49s
terraformexamplestest / test (rds)	3m 37s
terraformexamplestest / test (route53)	3m 51s
terraformexamplestest / test (sqs)	3m 30s
terraformexamplestest / test (wafv2)	3m 14s
	4h 44m 54s

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