Update Google's suggested builder

[edmorley]

Description

Currently the Pack CLI's suggested builders list contains an outdated Google builder image, gcr.io/buildpacks/builder:v1, which is based on the EOL Ubuntu 18.04 LTS:

pack/internal/builder/known_builder.go

Lines 12 to 18 in ce8db3c

	{
	Vendor: "Google",
	Image: "gcr.io/buildpacks/builder:v1",
	DefaultDescription: "GCP Builder for all runtimes",
	Suggested: true,
	Trusted: true,
	},

Proposed solution

• Add one of the newer Google builder images documented here: https://cloud.google.com/docs/buildpacks/builders
• Then either remove gcr.io/buildpacks/builder:v1 from the suggested/trusted builders list entirely, or demote it to only being a "trusted" builder and not also a "suggested" builder (now that the concepts are separate, after Separate suggested builders from default trusted builders #2043)

Describe alternatives you've considered

Continue to suggest a builder image that uses an EOL and insecure Ubuntu version.