Change to use API instead of the Location Header

(some trailing whitespace removed)

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

automated install/basic-install.sh

@@ -2229,7 +2229,7 @@ FTLinstall() {
     printf "  %b %s..." "${INFO}" "${str}"
 
     # Find the latest version tag for FTL
-    latesttag=$(curl -sI https://github.com/pi-hole/FTL/releases/latest | grep "Location" | awk -F '/' '{print $NF}')
+    latesttag=$(curl --silent "https://api.github.com/repos/pi-hole/ftl/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
     # Tags should always start with v, check for that.
     if [[ ! "${latesttag}" == v* ]]; then
         printf "%b  %b %s\\n" "${OVER}" "${CROSS}" "${str}"