next_hop_pubkey secp Verification only

[Evanfeenstra]

next_hop_pubkey takes T: secp256k1::Verification only, suggested by @valentinewallace in #2677

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d2242f6) 88.78% compared to head (c70961e) 88.75%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2693      +/-   ##
==========================================
- Coverage   88.78%   88.75%   -0.04%     
==========================================
  Files         112      112              
  Lines       88474    88474              
  Branches    88474    88474              
==========================================
- Hits        78553    78526      -27     
- Misses       7686     7711      +25     
- Partials     2235     2237       +2     

Files	Coverage Δ
lightning/src/ln/onion_utils.rs	91.50% <100.00%> (ø)

... and 9 files with indirect coverage changes

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