golang: bump github.com/aws/aws-sdk-go from 1.34.0 to 1.46.1 in /platform-tests #2589

Job	Run time
tests (lint)	3m 21s
tests (config_spec)	1m 8s
tests (tools_spec)	2m 33s
tests (concourse_spec)	1m 55s
tests (manifests_spec)	3m 37s
tests (terraform_spec)	2m 1s
tests (platform_tests_spec)	1m 50s
tests (compile_platform_tests)	1m 27s
	17m 52s

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