Sets CMP0135 policy behavior to NEW (backport #79)

[mergify[bot]]

This is an automatic backport of pull request #79 done by Mergify. Cherry-pick of 656e3102a8e4d8a17b7d9a342886c2d84a0b111b has failed:

On branch mergify/bp/humble/pr-79
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 656e310.
  (fix conflicts and run "git cherry-pick --continue")
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
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    both modified:   libcurl_vendor/CMakeLists.txt

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[Crola1702]

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