Prep v3.15.2 release
## Unreleased
+(None)
+## 3.15.2 (February 9, 2022)
- Infer default namespace from kubeconfig when not configured via the provider (https://github.com/pulumi/pulumi-kubernetes/pull/1896)
- Fix an error handling bug in await logic (https://github.com/pulumi/pulumi-kubernetes/pull/1899)
