UHD 4.9.0.1

Changes compared to UHD 4.9.0.0:

• Dependency changes
  • Support Boost 1.89.0
  • Drop support for boost below 1.71.0
• Fixes
  • Fix static build of libuhd
• Notes
  • We suggest to only update to this version if the boost 1.89.0 compability
    is required. Apart from the Boost build fixes, there are no other changes
    in this UHD release.