Update gcr.io/google.com/cloudsdktool/google-cloud-cli Docker tag to v481

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gcr.io/google.com/cloudsdktool/google-cloud-cli	final	major	480.0.0-debian_component_based -> 481.0.0-debian_component_based

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