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@sha256:026c0240584bbb0a13005fe5cea4b0af6c7a3a0e358e97c0636dfe0b17f513d0
+FROM docker.io/library/haproxy:2.8-alpine@sha256:afe4cd96fa1385f0753cb4dbacd8ad2765217ec8961181eeaf0f39bcf3f4374d
 
 EXPOSE 2375
 ENV ALLOW_RESTARTS=0 \