Update mysql Docker tag to v8.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
mysql	minor	8.0.35 -> 8.3.0

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (21fc34d) 72.80% compared to head (cb7b052) 72.80%. Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19529   +/-   ##
=======================================
  Coverage   72.80%   72.80%           
=======================================
  Files        1258     1258           
  Lines       73213    73213           
  Branches     9716     9716           
=======================================
  Hits        53306    53306           
  Misses      19121    19121           
  Partials      786      786           

Flag	Coverage Δ
admin-tests	40.91% <ø> (ø)
e2e-tests	81.59% <ø> (ø)

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[daniellockyer]

Closing as we don't use this in production atm