chore: Update libxrpl to 2.6.1

[PeterChen13579]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.94%. Comparing base (4885563) to head (0f0eba6).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2656      +/-   ##
===========================================
- Coverage    79.95%   79.94%   -0.02%     
===========================================
  Files          384      384              
  Lines        16037    16037              
  Branches      8387     8387              
===========================================
- Hits         12823    12821       -2     
- Misses        1925     1926       +1     
- Partials      1289     1290       +1     

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[mathbunnyru]

Please:

• let's start PR names with a capital letter after type of commit (changelog will look better)
• add version you're updating to