Pin test to `legacy` resolver to force desired error message #3615

Job	Run time
Deploy (bundler, bundler)	39s
Deploy (cargo, cargo)	42s
Deploy (composer, composer)	32s
Deploy (docker, docker)	34s
Deploy (elm, elm)	39s
Deploy (git_submodules, gitsubmodule)	40s
Deploy (github_actions, github-actions)	36s
Deploy (go_modules, gomod)	31s
Deploy (gradle, gradle)	42s
Deploy (hex, mix)	47s
Deploy (maven, maven)	24s
Deploy (npm_and_yarn, npm)	37s
Deploy (nuget, nuget)	47s
Deploy (pub, pub)	52s
Deploy (python, pip)	55s
Deploy (swift, swift)	58s
Deploy (terraform, terraform)	28s
	11m 23s

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