Remove unused addrs from peerstore

[gammazero]

Remove unused addrs from peerstore to prevent addresses that are no longer valid from continuing to be used.

Confirmed this to fix a publisher address that was no longer valid and should have been replaced by a different address.

Fixes #127

Update non-critical log messages to log at debug level.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c886fd4) 61.32% compared to head (07c2bf5) 61.61%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
+ Coverage   61.32%   61.61%   +0.28%     
==========================================
  Files          57       57              
  Lines        4913     4929      +16     
==========================================
+ Hits         3013     3037      +24     
+ Misses       1573     1566       -7     
+ Partials      327      326       -1     

Files	Coverage Δ
dagsync/subscriber.go	69.02% <88.00%> (+0.78%)	⬆️

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.