fix: use create_new instead of create for mutex file

[koivunej]

Release for "backporting" of #6012.

[github-actions]

2424 tests run: 2296 passed, 0 failed, 128 skipped (full report)

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Flaky tests (1)

Postgres 15

• test_ondemand_download_timetravel[mock_s3]: debug

Code coverage (full report)

• functions: 54.1% (9002 of 16636 functions)
• lines: 81.6% (52538 of 64390 lines)

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_{The comment gets automatically updated with the latest test results
40087b8 at 2023-12-01T13:34:56.166Z :recycle:}