[Minor] Use local and compressed phishtank mirror

conf/modules.d/phishing.conf

@@ -21,7 +21,7 @@ phishing {
     openphish_map = "https://www.openphish.com/feed.txt";
     # Disabled by default
     phishtank_enabled = false;
-    phishtank_map = "http://data.phishtank.com/data/online-valid.json";
+    phishtank_map = "https://rspamd.com/phishtank/online-valid.json.zst";
 
     # Make exclusions for known redirectors
     redirector_domains = [