Wrap connections in waiter channels in a drop guard

[djc]

No description provided.

[codecov]

Codecov Report

Merging #91 (a21f8f7) into main (fc39fd3) will decrease coverage by 0.18%.
The diff coverage is 88.00%.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
- Coverage   80.57%   80.38%   -0.19%     
==========================================
  Files           6        6              
  Lines         659      668       +9     
==========================================
+ Hits          531      537       +6     
- Misses        128      131       +3     

Impacted Files	Coverage Δ
bb8/src/inner.rs	81.66% <83.33%> (-0.98%)	⬇️
bb8/src/internals.rs	92.40% <89.47%> (-1.80%)	⬇️

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