Update git to 2.50.1 on Ubuntu 20.04 without building from source (user-scope)

update-git.sh

mkdir -p ~/opt/git
cd ~/opt/git

# download packages
wget https://ppa.launchpadcontent.net/git-core/ppa/ubuntu/pool/main/g/git/git_2.50.1-0ppa1~ubuntu20.04.1_amd64.deb
wget https://ppa.launchpadcontent.net/git-core/ppa/ubuntu/pool/main/g/git/git-man_2.50.1-0ppa1~ubuntu20.04.1_all.deb
dpkg-deb -x git_*.deb root
dpkg-deb -x git-man_*.deb root

mkdir -p ~/bin

cat > ~/bin/git <<'EOF'
#!/usr/bin/env bash
ROOT="$HOME/opt/git/root/usr"

export PATH="$ROOT/bin:$PATH"
export GIT_EXEC_PATH="$ROOT/lib/git-core"

exec "$ROOT/bin/git" "$@"
EOF

chmod +x ~/bin/git