feat: Restrict use of masterKey to localhost by default (#8281)

BREAKING CHANGE: This release restricts the use of `masterKey` to localhost by default; if you are using Parse Dashboard on a different server to connect to Parse Server you need to add the IP address of the server that hosts Parse Dashboard to this option (#8281)

src/Config.js

@@ -435,9 +435,12 @@ export class Config {
   }
 
   static validateMasterKeyIps(masterKeyIps) {
-    for (const ip of masterKeyIps) {
+    for (let ip of masterKeyIps) {
+      if (ip.includes('/')) {
+        ip = ip.split('/')[0];
+      }
       if (!net.isIP(ip)) {
-        throw `Invalid ip in masterKeyIps: ${ip}`;
+        throw `The Parse Server option "masterKeyIps" contains an invalid IP address "${ip}".`;
       }
     }
   }