README regen triggered by 3.1.8 release(s)

Author: github-actions[bot]

README.md

@@ -2,7 +2,7 @@
 
 -	[`3.3-dev0`, `3.3`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/3.3/Dockerfile)
 -	[`3.2.0`, `3.2`, `latest`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/3.2/Dockerfile)
--	[`3.1.7`, `3.1`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/3.1/Dockerfile)
+-	[`3.1.8`, `3.1`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/3.1/Dockerfile)
 -	[`3.0.10`, `3.0`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/3.0/Dockerfile)
 -	[`2.9.15`, `2.9`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/2.9/Dockerfile)
 -	[`2.8.15`, `2.8`](https://github.com/haproxytech/haproxy-docker-ubuntu/blob/main/2.8/Dockerfile)