golang: bump github.com/onsi/ginkgo/v2 from 2.9.2 to 2.12.0 in /tools/pipecleaner #2381

Job	Run time
tests (lint)	3m 43s
tests (config_spec)	1m 18s
tests (tools_spec)	2m 38s
tests (concourse_spec)	1m 39s
tests (manifests_spec)	3m 51s
tests (terraform_spec)	1m 33s
tests (platform_tests_spec)	1m 38s
tests (compile_platform_tests)	1m 31s
	17m 51s

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