main/haproxy: upgrade to 2.6.4
https://www.haproxy.org/download/2.6/src/CHANGELOG
2022/08/22 : 2.6.4
- BUG/MINOR: ssl/cli: error when the ca-file is empty
- BUG/MAJOR: mworker: fix infinite loop on master with no proxies.https://www.haproxy.org/download/2.6/src/CHANGELOG
2022/08/22 : 2.6.4
- BUG/MINOR: ssl/cli: error when the ca-file is empty
- BUG/MAJOR: mworker: fix infinite loop on master with no proxies.