Merge tag '2.6.1-rc1' into ximinez/merge-261rc1

2.6.1-rc1

* tag '2.6.1-rc1':
  Set version to 2.6.1-rc1
  Downgrade to boost 1.83

Author: ximinez

src/libxrpl/protocol/BuildInfo.cpp

@@ -36,7 +36,7 @@ namespace BuildInfo {
 //  and follow the format described at http://semver.org/
 //------------------------------------------------------------------------------
 // clang-format off
-char const* const versionString = "2.6.0"
+char const* const versionString = "2.6.1-rc1"
 // clang-format on
 
 #if defined(DEBUG) || defined(SANITIZER)