Use tempfile::TempDir::keep() instead of deprecated into_path()
#14784
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tempfilehas deprecatedTempDir::into_path()(replacing it byTempDir::keep()between version3.3which Clippy required and version3.20which is the latest semver-compatible version. Since Clippy doesn't use aCargo.lockfile, the latest version oftempfileis used which leads to CI failure.changelog: none
r? @flip1995