fix ci branches

(cherry picked from commit e7d7016018)

# Conflicts:
#	.github/workflows/dockerimage.yml

[skip ci]

.github/workflows/dockerimage.yml

@@ -4,8 +4,8 @@ on:
   push:
     # Publish `master` as Docker `latest` image.
     branches:
-      - master
-      - v6
+      - master
+      - v5
 
     # Publish `v1.2.3` tags as releases.
     tags:

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.17.3 as build
 
-ARG SQUID_VER=6.0.2
+ARG SQUID_VER=5.9
 
 RUN set -x && \
 	apk add --no-cache  \