Pin test to `legacy` resolver to force desired error message (#7738) #574

Job	Run time
date-version	1s
Deploy (bundler, bundler)	27s
Deploy (cargo, cargo)	42s
Deploy (composer, composer)	38s
Deploy (docker, docker)	26s
Deploy (elm, elm)	34s
Deploy (git_submodules, gitsubmodule)	29s
Deploy (github_actions, github-actions)	25s
Deploy (go_modules, gomod)	32s
Deploy (gradle, gradle)	25s
Deploy (hex, mix)	36s
Deploy (maven, maven)	37s
Deploy (npm_and_yarn, npm)	46s
Deploy (nuget, nuget)	37s
Deploy (pub, pub)	38s
Deploy (python, pip)	1m 11s
Deploy (swift, swift)	53s
Deploy (terraform, terraform)	26s
	10m 23s

Provide feedback