Fix dep versions

[benjeffery]

Seems some updates broke our CI dependency set, the 3.7 pins needed removing anyway.

[codecov]

Codecov Report

Merging #2875 (9ab5829) into main (813f4ed) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2875   +/-   ##
=======================================
  Coverage   89.69%   89.69%           
=======================================
  Files          30       30           
  Lines       30159    30159           
  Branches     5860     5860           
=======================================
  Hits        27052    27052           
  Misses       1778     1778           
  Partials     1329     1329           

Flag	Coverage Δ
c-tests	86.09% <ø> (ø)
lwt-tests	80.78% <ø> (ø)
python-c-tests	67.89% <ø> (ø)
python-tests	98.92% <ø> (ø)

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