Upgrade CFFI to be compatible with python3.11

Author: olksdr

py/manylinux.sh

@@ -4,8 +4,13 @@ set -e
 # Install dependencies needed by our wheel
 yum -y -q -e 0 install gcc libffi-devel
 
-# upgrade wheel
+# Upgrade wheel
 /opt/python/cp311-cp311/bin/pip install --upgrade wheel
+# Milksnake 0.1.6 relies on CFFI.
+# Python 3.11 has some known compatibility issues with older versions of CFFI,
+# leading to errors during usage of milksnake.
+# Upgrade CFFI to latest and fresh version
+/opt/python/cp311-cp311/bin/pip install --upgrade cffi
 
 # Install Rust
 curl https://sh.rustup.rs -sSf | sh -s -- -y