Proposed 2.6.1 (release branch)

[ximinez]

High Level Overview of Change

The base branch is release. This PR branch will be pushed directly to
release and master (not squashed or rebased, and not using the
GitHub UI).

This PR only changes the version number in release.

See also #5831

Type of Change

• Release

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.8%. Comparing base (c46888f) to head (70d5c62).
⚠️ Report is 1 commits behind head on release.

Additional details and impacted files

@@           Coverage Diff           @@
##           release   #5830   +/-   ##
=======================================
  Coverage     78.8%   78.8%           
=======================================
  Files          814     814           
  Lines        71310   71309    -1     
  Branches      8346    8346           
=======================================
+ Hits         56197   56198    +1     
+ Misses       15113   15111    -2     

Files with missing lines	Coverage Δ
src/libxrpl/protocol/BuildInfo.cpp	98.2% <ø> (ø)

... and 4 files with indirect coverage changes

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