[Fix] fixed "cannot find dependency on symbol 1" issue when using replaced symbols in spamassassin rules

src/plugins/lua/spamassassin.lua

@@ -1566,7 +1566,7 @@ local function post_process()
           else
             local rspamd_symbol, replaced_symbol = replace_symbol(a)
             if replaced_symbol then
-              external_deps[a] = {rspamd_symbol}
+              external_deps[a] = {[rspamd_symbol] = true}
             else
               external_deps[a] = {}
             end