Bump alpine from 3.10.1 to 3.13.4#17

dependabot-preview[bot] wants to merge 1 commit intodevelopcodechimp-io/ffmpeg-alpine:developfrom

dependabot/docker/develop/alpine-3.13.4codechimp-io/ffmpeg-alpine:dependabot/docker/develop/alpine-3.13.4Copy head branch name to clipboard