output mediawiki version to install_version.txt[mediawiki]

[qiaofeng1227]

output mediawiki version to install_version.txt[mediawiki]

[zengxc-1996]

tested OK

ok: [47.242.212.209] => {
    "end_check_versions.stdout_lines": [
        "httpd  Server version: Apache/2.4.46 (IUS)",
        "mysql  Ver 14.14 Distrib 5.7.34, for Linux (x86_64) using  EditLine wrapper",
        "PHP 7.4.19 (cli) (built: May  4 2021 11:06:37) ( NTS )",
        "Docker version 20.10.6, build 370c289",
        "phpmyadmin version: \"version\": \"5.1.0\",",
        "Redis server v=5.0.9 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=e6194d1353b8ed9",
        "mediawiki version: 1.35.1/",
        "System version: CentOS 7.9",
        "Image name: mediawikizengxc-CentOS7.9"
    ]
}