Update missing dependency for IGC builds

Update mako dependency to Python 3 version.
Commit 2f66670 has introduced the dependency on Python's mako module.

Author: fda0

scripts/buildIGC.sh

@@ -49,7 +49,7 @@ else
 fi
 
 apt-get update
-apt-get install -y flex bison libz-dev cmake curl wget build-essential git software-properties-common unzip file lsb-release python-mako
+apt-get install -y flex bison libz-dev cmake curl wget build-essential git software-properties-common unzip file lsb-release python3-mako
 echo "[Build Status] flex bison libz-dev cmake curl wget build-essential git software-properties-common unzip file INSTALLED"
 
 if [ "$UBUNTU_VERSION" = "20.04" ]; then