Bump CNB_PLATFORM_API to v0.12 (#4686) #634

Job	Run time
Start	8s
Build Piper	1m 43s
Build integration tests	27s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 33s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 34s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 6s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 42s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 24s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 27s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 18s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 16s
Run integration tests ("TestGolangIntegration")	1m 49s
Run integration tests ("TestGradleIntegration")	1m 22s
Run integration tests ("TestMavenIntegration")	1m 48s
Run integration tests ("TestMTAIntegration")	1m 54s
Run integration tests ("TestTmsUploadIntegration")	56s
Run integration tests ("TestTmsExportIntegration")	45s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 3s
Finish	1m 9s
	26m 24s

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