Update pulumi/pulumi dependency to 3.187.0 (#568)

Fixes https://github.com/pulumi/pulumi-docker-build/issues/551
(sort of - the underlying problem that this repo pins SDK dependencies
that don't get automatically update by the workflow still exists, but it
should at least work until the codegen APIs change again.)

sdk/python/pulumi_docker_build/config/vars.py

@@ -2,8 +2,7 @@
 # *** WARNING: this file was generated by pulumi-language-python. ***
 # *** Do not edit by hand unless you're certain you know what you are doing! ***
 
-import builtins
-import copy
+import builtins as _builtins
 import warnings
 import sys
 import pulumi
@@ -22,14 +21,14 @@ __config__ = pulumi.Config('docker-build')
 
 
 class _ExportableConfig(types.ModuleType):
-    @property
+    @_builtins.property
     def host(self) -> str:
         """
         The build daemon's address.
         """
         return __config__.get('host') or (_utilities.get_env('DOCKER_HOST') or '')
 
-    @property
+    @_builtins.property
     def registries(self) -> Optional[str]:
         return __config__.get('registries')