Changes

Use Files.createTempFile() in DefaultTrustListManagerTest

This fixes temporary file information disclosure vulnerability due to the use
of the vulnerable `File.createTempFile()` method. The vulnerability is fixed by
using the `Files.createTempFile()` method which sets the correct posix permissions.

Co-authored-by: Moderne <team@moderne.io>
Reported-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
Signed-off-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
 (commit: c662757)