Revert "Update docker version during btcpay-update (#847)"

This reverts commit 9f865a5240.

helpers.sh

@@ -144,30 +144,6 @@ docker_update() {
             apt install libseccomp2 -t buster-backports
         fi
     fi
-
-    # Can't run with docker-ce before 20.10.10... check against version 21 instead, easier to compare
-    if [ "21" \> "$(docker version -f "{{ .Server.Version }}")" ]; then
-        echo "Updating docker, old version can't run some images (https://docs.linuxserver.io/FAQ/#jammy)"
-        echo \
-        "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
-        "$(lsb_release -cs)" stable" | \
-        tee /etc/apt/sources.list.d/docker.list > /dev/null
-
-        apt-get update
-        apt-get upgrade -y  docker-ce docker-ce-cli containerd.io
-
-        # Possible that old distro like xenial doesn't have it anymore, if so, just take
-        # the next distrib
-        if [ "21" \> "$(docker version -f "{{ .Server.Version }}")" ]; then
-            echo "Updating docker, with bionic's version"
-            echo \
-            "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
-            bionic stable" | \
-            tee /etc/apt/sources.list.d/docker.list > /dev/null
-            apt-get update
-            apt-get upgrade -y  docker-ce docker-ce-cli containerd.io
-        fi
-    fi
 }
 
 btcpay_up() {