Explicitly use DOH

Reference to https://github.com/acmesh-official/acme.sh/issues/3487

DOH_CLOUDFLARE=1
DOH_GOOGLE=2
DOH_ALI=3
DOH_DP=4 

Explicitly use Aliyun DNS:

cd .acme.sh
echo "export DOH_USE=3" >> acme.sh.env
source acme.sh.env