Drop `python` `3.6` #3916

Job	Run time
Deploy (bundler, bundler)	33s
Deploy (cargo, cargo)	39s
Deploy (composer, composer)	40s
Deploy (docker, docker)	43s
Deploy (elm, elm)	39s
Deploy (git_submodules, gitsubmodule)	36s
Deploy (github_actions, github-actions)	35s
Deploy (go_modules, gomod)	34s
Deploy (gradle, gradle)	26s
Deploy (hex, mix)	43s
Deploy (maven, maven)	25s
Deploy (npm_and_yarn, npm)	42s
Deploy (nuget, nuget)	28s
Deploy (pub, pub)	49s
Deploy (python, pip)	1m 0s
Deploy (swift, swift)	47s
Deploy (terraform, terraform)	37s
	10m 56s

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