fix: Use builtin source_env_if_exists for sourcing .envrc.local

Author: Uzaaft

.envrc

@@ -5,5 +5,4 @@ if has nix; then
   use flake
 fi
 
-# Source an `.envrc.local` if it exists. You can add your custom changes there.
-[[ -f .envrc.local ]] && source_env .envrc.local
+source_env_if_exists .envrc.local