fix: lower warning about mempool nonce caching to debug!

[obycode]

Description

The warning about failing to cache mempool nonces shows up very often during normal execution of the node. It should not be a warning. This PR lowers it to a debug message.

error caching nonce to sqlite: database is locked

Applicable issues

• fixes #

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[codecov]

Codecov Report

Merging #3964 (fb36ff3) into master (e4630ec) will decrease coverage by 58.26%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #3964       +/-   ##
===========================================
- Coverage   58.31%    0.06%   -58.26%     
===========================================
  Files           1      300      +299     
  Lines         571   276551   +275980     
===========================================
- Hits          333      179      -154     
- Misses        238   276372   +276134     

Files Changed	Coverage Δ
src/core/mempool.rs	0.00% <0.00%> (ø)

... and 300 files with indirect coverage changes

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[jcnelson]

What was the logged error in this case?

[obycode]

What was the logged error in this case?

I'm not sure what you're asking. It was just the above mentioned: error caching nonce to sqlite: database is locked.

[jcnelson]

Ah, I missed that 🤦 I just went straight to the code