Terminal Alkyne in Suzuki Coupling
If TLC is the only analysis we have, it may be difficult to determine exactly what is happening (or not happening). Other things that might be happening include homocoupling (biaryl formation), proteo-deborylation, and debromination. These may be hard to discern by TLC alone. 

If there is no reaction of starting materials this might be due to:


Failure to reduce Pd(II) precatalyst to active Pd(0) species: your catalytic cycle never initiates. Consult chapter 1 of Negishi's Handbook of Organopalladium Chemistry for Organic Synthesis. Consider adding a catalytic amount of exogenous reducing agent, changing the solvent to EtOH/PhMe/H2O, increasing the temperature, switching to a Pd(0) catalyst system, or a system that is more easily reduced to Pd(0) like Pd(OAc)2 + xs phosphine ligand.
Stalling in the catalytic cycle: there is insufficient energy to get over the activation barrier in the oxidative addition, transmetallation, or reductive elimination step. Try increasing the temperature.
Catalyst destruction by oxidation: did you degas your system with N2 or Ar?


Alkyne poisoning of the homogeneous Pd catalyst seems unlikely since there are plenty of examples with Sonogashira coupling of terminal alkynes involving dppfPdCl2 that work just fine.