remove 3.10 apk repo

Author: pehbehbeh

Dockerfile

@@ -9,7 +9,6 @@ ENV PHP_OPCACHE_VALIDATE_TIMESTAMPS="0" \
 RUN apk info \
     && echo @edge http://nl.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories \
     && echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories \
-    && echo @3.10 http://dl-cdn.alpinelinux.org/alpine/v3.10/main >> /etc/apk/repositories \
     && apk update \
     && apk upgrade \
     && apk add --no-cache --virtual .build-deps \