Pin test to `legacy` resolver to force desired error message #3591

Job	Run time
Deploy (bundler, bundler)	5s
Deploy (cargo, cargo)	6s
Deploy (composer, composer)	7s
Deploy (docker, docker)	5s
Deploy (elm, elm)	6s
Deploy (git_submodules, gitsubmodule)	6s
Deploy (github_actions, github-actions)	4s
Deploy (go_modules, gomod)	7s
Deploy (gradle, gradle)	6s
Deploy (hex, mix)	6s
Deploy (maven, maven)	6s
Deploy (npm_and_yarn, npm)	6s
Deploy (nuget, nuget)	5s
Deploy (pub, pub)	5s
Deploy (python, pip)	5s
Deploy (swift, swift)	8s
Deploy (terraform, terraform)	4s
	1m 37s

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