fix: add erlang version fetch for heroku-24

Author: gigatim

lib/canonical_version.sh

@@ -33,6 +33,10 @@ fetch_erlang_versions() {
       url="https://builds.hex.pm/builds/otp/ubuntu-22.04/builds.txt"
       curl -s "$url" | awk '/^OTP-([0-9.]+ )/ {print substr($1,5)}'
       ;;
+    "heroku-24")
+      url="https://builds.hex.pm/builds/otp/ubuntu-24.04/builds.txt"
+      curl -s "$url" | awk '/^OTP-([0-9.]+ )/ {print substr($1,5)}'
+      ;;
     *)
       url="https://raw.githubusercontent.com/HashNuke/heroku-buildpack-elixir-otp-builds/master/otp-versions"
       curl -s "$url"