Add an explicit flush and close before os.rename to fix EOFError: Ran out of input

[anmyachev]

Even with this fix: #1243 EOFError: Ran out of input error is observed when using yapf with pre-commit on powerful multi-core systems.

Before I suggest this change to you, I tested it in our repository using a fork: intel/intel-xpu-backend-for-triton#3324. For 5 days now I have not seen the error again, which gives me confidence to say that the change at least reduces the frequency of this problem, and at most solves it completely.

Hi @bwendling, could you review this change?

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[anmyachev]

Hi @bwendling!

EOFError: Ran out of input error has not been observed for 2 weeks now (with this fix). Friendly reminder to review.

Hi @hartwork, maybe you can review too.

[alexkau]

My team recently had to upgrade yapf to get python 3.13 compatibility, and we're now seeing this issue once or twice per week. We aren't using especially high-end build nodes (16 cpu, 32GB RAM), and we're not an especially large team. We're going to try switching to the forked version with this fix, but it seems like this issue might be widespread.