Fail to generate deposit addresses for soon to expire sigsets

[cwlittle]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (49f959a) 37.39% compared to head (bb45de7) 37.32%.
Report is 5 commits behind head on develop.

Files	Patch %	Lines
src/bitcoin/relayer.rs	3.57%	27 Missing ⚠️
src/bitcoin/mod.rs	0.00%	2 Missing ⚠️
src/bin/nomic.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #274      +/-   ##
===========================================
- Coverage    37.39%   37.32%   -0.07%     
===========================================
  Files           26       26              
  Lines         9317     9329      +12     
===========================================
- Hits          3484     3482       -2     
- Misses        5833     5847      +14     

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[mappum]

Since V4 was added after the last stakenet upgrade, we don't have to add a V5. This field can just be added to V4.

[mappum]

Also though - it does seem surprising that a relayer change involves a change to on-chain state, since this buffer doesn't affect consensus. Could we avoid that by using a constant (e.g. the buffer period is 10% of max_deposit_age)?