update minum delay to be compatible with Quantum Machines

[jevillegasd]

A tof routine while using OPX1000 returns

Invalidation ERROR time of flight@elements.0/acquisition: Time of flight must be a multiple of 4 and greater or equal than 28 (got 24)

This can be changed in the MINIMUM_TOF constant (this PR), or perhaps be part of the instrument bounds (part of the driver or in the configs json)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.73%. Comparing base (ed74278) to head (77e86bf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1385      +/-   ##
==========================================
- Coverage   96.86%   96.73%   -0.13%     
==========================================
  Files         133      133              
  Lines       10457    10457              
==========================================
- Hits        10129    10116      -13     
- Misses        328      341      +13     

Flag	Coverage Δ
unittests	96.73% <100.00%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ocols/signal_experiments/time_of_flight_readout.py	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[alecandido]

Sorry for the very late reply. I was postponing because of the failing tests, but they are actually failing at random... The change is minimal, and certainly fine.

[alecandido]

Btw, I agree it should be eventually moved to the drivers. It does not make sense to limit all the instruments to the one with the strongest requirement.
However, this is not high enough in priority to motivate the introduction of a dedicated configuration section for instruments, standardized across the various drivers. Also because we have to account for multiple instruments possibly involved, and in this case there is even a non-trivial interaction about the channel assignment (so, you should navigate to the instrument owning the channel, and find its limitation about the time of flight in the standard section).

In any case, we already have a close enough issue, and we can revisit this when we will look deeper into that qiboteam/qibolab#854