Silence `utcnow` deprecation warnings from `botocore` (#8508) #11142

Job	Run time
Caching (3.8)	13s
Caching (3.9)	7s
Caching (3.10)	6s
Caching (3.11)	12s
Caching (3.12)	10s
Caching (3.13)	19s
Linting (3.8)	3m 51s
Linting (3.9)	3m 52s
Linting (3.10)	3m 29s
Linting (3.11)	2m 51s
Linting (3.12)	3m 4s
Linting (3.13)	2m 53s
rubytest / test (3.3)	1m 5s
jstest / test	1m 17s
dotnettest / test	1m 34s
javatest / test	1m 10s
terraformexamplestest / Find Jobs	6s
test / test (3.8)	18m 5s
test / test (3.9)	17m 30s
test / test (3.10)	17m 15s
testproxy / test (ubuntu-latest, 3.10)	4m 24s
test / test (3.11)	16m 45s
testproxy / test (ubuntu-latest, 3.11)	4m 9s
testserver / test (3.8)	19m 6s
test / test (3.12)	17m 11s
testproxy / test (ubuntu-latest, 3.12)	4m 18s
testserver / test (3.9)	19m 6s
test / test (3.13)	16m 10s
testproxy / test (windows-latest, 3.10)	7m 0s
testserver / test (3.10)	16m 51s
testproxy / test (windows-latest, 3.11)	7m 16s
testserver / test (3.11)	16m 33s
testproxy / test (windows-latest, 3.12)	6m 1s
testserver / test (3.12)	17m 9s
terraformexamplestest / test (acm)	4m 19s
terraformexamplestest / test (autoscaling)	2m 54s
terraformexamplestest / test (awslambda)	4m 3s
terraformexamplestest / test (cloudfront)	4m 1s
terraformexamplestest / test (codebuild)	2m 45s
terraformexamplestest / test (ds)	3m 57s
terraformexamplestest / test (ec2)	3m 24s
terraformexamplestest / test (elb)	3m 52s
terraformexamplestest / test (iam)	2m 43s
terraformexamplestest / test (rds)	3m 59s
terraformexamplestest / test (route53)	3m 53s
terraformexamplestest / test (sqs)	3m 42s
terraformexamplestest / test (wafv2)	3m 30s
	4h 58m 10s

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