Update deps and Alpine image

- Updated deps
- Updated Alpine images to 3.16
- Removed dumb-init, not needed anymore
- Some small shellcheck tweaks on the start/healthcheck scripts

docker/start.sh

@@ -9,15 +9,15 @@ fi
 
 if [ -d /etc/vaultwarden.d ]; then
     for f in /etc/vaultwarden.d/*.sh; do
-        if [ -r $f ]; then
-            . $f
+        if [ -r "${f}" ]; then
+            . "${f}"
         fi
     done
 elif [ -d /etc/bitwarden_rs.d ]; then
     echo "### You are using the old /etc/bitwarden_rs.d script directory, please migrate to /etc/vaultwarden.d ###"
     for f in /etc/bitwarden_rs.d/*.sh; do
-        if [ -r $f ]; then
-            . $f
+        if [ -r "${f}" ]; then
+            . "${f}"
         fi
     done
 fi