[Deps] update finn-base to get fpgadataflow.util changes

docker/finn_entrypoint.sh

@@ -12,7 +12,7 @@ gecho () {
 
 # checkout the correct dependency repo commits
 # the repos themselves are cloned in the Dockerfile
-FINN_BASE_COMMIT=ceb1219b5aba396dde41967a929e1f08887653ce
+FINN_BASE_COMMIT=a39fadfccd96469c467b0e234ed98ec19b6cf5b3
 BREVITAS_COMMIT=6ffefa8dbf37fdb0f44c994f34604c29fadb16b0
 CNPY_COMMIT=4e8810b1a8637695171ed346ce68f6984e585ef4
 HLSLIB_COMMIT=cfafe11a93b79ab1af7529d68f08886913a6466e