[WIP] Greatly reduce the interval between redemption retries

Relates to #146 (closed)

This is probably not a great solution. In the case where a voucher is never paid, it imposes a much greater burden on both the client and the payment server.

Still, here's what it looks like.

Created by: codecov[bot]

Codecov Report

Merging #150 into master will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   96.75%   96.78%   +0.02%     
==========================================
  Files          43       43              
  Lines        3479     3479              
  Branches      455      455              
==========================================
+ Hits         3366     3367       +1     
+ Misses         77       76       -1     
  Partials       36       36              

Impacted Files	Coverage Δ
src/_zkapauthorizer/controller.py	93.35% <100.00%> (ø)
src/_zkapauthorizer/tests/test_client_resource.py	99.25% <0.00%> (+0.37%)

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