Fix some coroutine function logging

[exarkun]

Fixes #434

[codecov[bot]]

Codecov Report

Merging #436 (305862a) into main (c27417c) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #436      +/-   ##
==========================================
- Coverage   95.24%   95.22%   -0.03%     
==========================================
  Files          62       62              
  Lines        8011     8013       +2     
  Branches     1035     1035              
==========================================
  Hits         7630     7630              
- Misses        276      277       +1     
- Partials      105      106       +1     

Impacted Files	Coverage Δ
src/_zkapauthorizer/eliot.py	97.72% <100.00%> (+0.10%)	:arrow_up:
src/_zkapauthorizer/replicate.py	95.18% <100.00%> (ø)
src/_zkapauthorizer/tests/matchers.py	83.52% <0.00%> (-3.53%)	:arrow_down:
...rc/_zkapauthorizer/tests/test_lease_maintenance.py	96.50% <0.00%> (-1.50%)	:arrow_down:
src/_zkapauthorizer/lease_maintenance.py	93.51% <0.00%> (ø)
src/_zkapauthorizer/tahoe.py	92.81% <0.00%> (+0.65%)	:arrow_up:
src/_zkapauthorizer/tests/_float_matchers.py	93.93% <0.00%> (+6.06%)	:arrow_up:

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