Add CI timeout to codecov job

[frenck]

Proposed change

I've recently seen a couple of codecov jobs running a long time, until timeout and fail (more than an hour).
Not sure what is going on, but codecov jobs should not hold on to our runners that long.

This sets the time out to 10 minutes. If the job doesn't finish within that timeframe, something is really wrong.

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[epenet]

I've seen it fail quite a few times recently too.

It normally takes under 10 seconds. You can probably even reduce this to 1, or maybe 2 minutes.

[frenck]

not really needed, a small hickup is fine to handle.
It just prevents it running for hours.

[frenck]

Related upstream issue codecov/codecov-action#926