[Deps] update Brevitas to get bipolar threshold export fix

docker/finn_entrypoint.sh

@@ -13,7 +13,7 @@ gecho () {
 
 # checkout the correct dependency repo commits
 # the repos themselves are cloned in the Dockerfile
-BREVITAS_COMMIT=5b22bc02bada6e699bf80fd602a00eb44789dc22
+BREVITAS_COMMIT=e661e5275355e3dce47142ec26b4127954e48539
 CNPY_COMMIT=4e8810b1a8637695171ed346ce68f6984e585ef4
 HLSLIB_COMMIT=6b88db826bb023937506913a23d964775a7606af
 PYVERILATOR_COMMIT=1d89cb0d4e0c97469cc6352c611f876ec13edfa6