397.retry recover

[meejah]

#397 was "mostly" done via other factoring; allow clients to retry.

[codecov]

Codecov Report

Merging #411 (3edb65e) into main (148f92f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #411   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files          63       63           
  Lines        7511     7541   +30     
  Branches     1013     1015    +2     
=======================================
+ Hits         7231     7260   +29     
  Misses        208      208           
- Partials       72       73    +1     

Impacted Files	Coverage Δ
src/_zkapauthorizer/recover.py	97.65% <100.00%> (ø)
src/_zkapauthorizer/resource.py	99.24% <100.00%> (+<0.01%)	⬆️
src/_zkapauthorizer/tests/test_client_resource.py	98.32% <100.00%> (+0.32%)	⬆️
src/_zkapauthorizer/tests/strategies.py	96.47% <0.00%> (-0.71%)	⬇️

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