restrict the types accepted by the other log_call helpers

[exarkun]

Follow-up on #434 - there are two more logging decorators that can be improved similarly.

[codecov[bot]]

Codecov Report

Merging #439 (af8f548) into main (52e2296) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   95.22%   95.25%   +0.03%     
==========================================
  Files          62       62              
  Lines        8013     8014       +1     
  Branches     1035     1035              
==========================================
+ Hits         7630     7634       +4     
+ Misses        277      274       -3     
  Partials      106      106              

Impacted Files	Coverage Δ
src/_zkapauthorizer/_types.py	85.71% <100.00%> (ø)
src/_zkapauthorizer/eliot.py	97.77% <100.00%> (+0.05%)	:arrow_up:
src/_zkapauthorizer/tahoe.py	92.15% <0.00%> (-0.66%)	:arrow_down:
src/_zkapauthorizer/tests/test_client_resource.py	98.30% <0.00%> (+0.21%)	:arrow_up:
...rc/_zkapauthorizer/tests/test_lease_maintenance.py	98.50% <0.00%> (+2.00%)	:arrow_up:

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