chore(deps): update docker.io/library/haproxy docker tag to v2.8

This MR contains the following updates:

Package	Type	Update	Change
docker.io/library/haproxy	final	minor	2.7-alpine -> 2.8-alpine

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Dockerfile

-FROM docker.io/library/haproxy:2.7-alpine@sha256:406e20a9db1206ff5887641b3d6d5bfa9319eec4b991493b4dd3b973addbbc00
+FROM docker.io/library/haproxy:2.8-alpine@sha256:4a9ad000c8f85fc29d7fb264886505fd196d1721b8314b80ce0d36c4c96c56a2
 
 EXPOSE 2375
 ENV ALLOW_RESTARTS=0 \