ci: remove deprecated LABEL maintainer

Author: Mizux

ci/docker/alpine/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/_/alpine
 FROM alpine:edge AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN apk add --no-cache git build-base linux-headers cmake

ci/docker/archlinux/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/_/archlinux/
 FROM archlinux:latest AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN pacman -Syu --noconfirm git base-devel cmake

ci/docker/centos/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://quay.io/repository/centos/centos
 FROM quay.io/centos/centos:stream AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN dnf -y update \

ci/docker/debian/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/_/debian
 FROM debian:latest AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN apt-get update -qq \

ci/docker/fedora/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/_/fedora
 FROM fedora:latest AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN dnf -y update \

ci/docker/opensuse/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/r/opensuse/tumbleweed
 FROM opensuse/tumbleweed AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN zypper update -y \

ci/docker/ubuntu/Dockerfile

@@ -1,7 +1,7 @@
 # Create a virtual environment with all tools installed
 # ref: https://hub.docker.com/_/ubuntu
 FROM ubuntu:rolling AS env
-LABEL maintainer="[email protected]"
+
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH
 RUN apt-get update -q \