appimage: update package (git) in dockerfile (#7786)
appimage: update package (git) in dockerfile (#7786)

https://launchpad.net/ubuntu/+source/git/1:2.17.1-1ubuntu0.11
spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum