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:a04d01b4829f769385b977533495f28f06de74e604b63ba4964f957a017c865d
+FROM docker.io/library/haproxy:2.8-alpine@sha256:a2481d93df302ac2082bea45bc79388273f432747bff0d58d4b6928be2f693ce
 
 EXPOSE 2375
 ENV ALLOW_RESTARTS=0 \