Update Default Fallback Version for npm to `npm8` #26567

Job	Run time
Lint	57s
Updater	2m 25s
ci (bundler, bundler1, bundler)	9s
integration	3m 50s
ci (bundler, bundler2, bundler)	10s
ci (cargo, cargo, cargo)	9s
ci (common, common, common)	53s
ci (composer, composer, composer)	9s
ci (docker, docker, docker)	9s
ci (elm, elm, elm)	10s
ci (git_submodules, git_submodules, gitsubmodule)	9s
ci (github_actions, github_actions, github-actions)	10s
ci (go_modules, go_module, gomod)	14s
ci (gradle, gradle, gradle)	9s
ci (hex, hex, mix)	12s
ci (maven, maven, maven)	9s
ci (npm_and_yarn, npm_and_yarn, npm)	6m 22s
ci (nuget, nuget, nuget)	8s
ci (pub, pub, pub)	12s
ci (python, python, pip)	12s
ci (python, python_slow, pip)	13s
ci (swift, swift, swift)	8s
ci (devcontainers, devcontainers, devcontainers)	12s
ci (terraform, terraform, terraform)	14s
	17m 45s

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