Updates Conan dependencies: Boost

[bthomee]

High Level Overview of Change

This PR updates Boost to version 1.86.0. Only minor changes were necessary to the code.

Context of Change

Dependency scanning revealed that current dependencies are out of date. Updating dependencies allows us to take advantage of bug fixes, new features, and/or security improvements.

Type of Change

• Refactor (non-breaking change that only restructures code)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.2%. Comparing base (f608e65) to head (8029ca7).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5264   +/-   ##
=======================================
  Coverage     78.1%   78.2%           
=======================================
  Files          795     795           
  Lines        68448   68482   +34     
  Branches      8276    8282    +6     
=======================================
+ Hits         53484   53526   +42     
+ Misses       14964   14956    -8     

Files with missing lines	Coverage Δ
include/xrpl/basics/Log.h	71.4% <ø> (ø)
src/libxrpl/basics/FileUtilities.cpp	71.4% <100.0%> (ø)
src/xrpld/app/main/Application.cpp	69.3% <ø> (ø)
src/xrpld/app/main/Main.cpp	79.0% <ø> (ø)

... and 16 files with indirect coverage changes

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