Bump minimum pulumi requirement

[blampe]

pulumi/pulumi#17898 was a breaking change for projects that directly depend on pulumi/sdk but not pulumi/pkg, which is the case with several native providers.

If these projects upgrade to [email protected] or later, they can still indirectly depend on earlier versions of pkg via libraries like this one. This leads to errors like the following:

go: github.com/pulumi/pulumi-command/provider/pkg/provider tested by
	github.com/pulumi/pulumi-command/provider/pkg/provider.test imports
	github.com/pulumi/providertest imports
	github.com/pulumi/pulumi/pkg/v3/testing/integration imports
	github.com/pulumi/pulumi/sdk/v3/go/common/tools: cannot find module providing package github.com/pulumi/pulumi/sdk/v3/go/common/tools

This bumps our minimum required version of pkg to one which accounts for pulumi/pulumi#17898.

This problem is self-inflicted and only exists because we choose to version sdk and pkg separately despite there being a tight coupling between the two. We would not have this problem if we released them together as a single module with sdk and pkg packages.

[pulumi-bot]

This PR has been shipped in release v0.1.4.