build(deps): bump github.com/zclconf/go-cty from 1.13.2 to 1.15.0 in /pkg #3195

Job	Run time
prerequisites	5m 54s
Lint pkg	3m 2s
test_integrations (stack-reference)	2m 3s
test_integrations (stack-transformation)	2m 5s
test_integrations (adopt-into-component)	2m 21s
go-tests	7m 55s
test_integrations (rename)	2m 14s
examples	0s
test_integrations (rename-component)	2m 10s
test_integrations (rename-component-and-child)	2m 19s
test_templates	0s
test_integrations (retype-component)	4m 18s
test_integrations (retype-parents)	2m 3s
	36m 24s

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