Speed up net.sh builds (bp #16360)

[mergify]

This is an automatic backport of pull request #16360 done by Mergify.

Cherry-pick of 6cd4bc5 has failed:

On branch mergify/bp/v1.6/pr-16360
Your branch is up to date with 'origin/v1.6'.

You are currently cherry-picking commit 6cd4bc5e6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cargo
	modified:   ci/do-audit.sh
	modified:   ci/test-checks.sh
	modified:   net/net.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   scripts/cargo-install-all.sh

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure