Replace deprecated property

src/api/start.ts

@@ -15,7 +15,7 @@ try {
 	console.log("[API] Failed to get thread count! Using 1...");
 }
 
-if (cluster.isMaster && process.env.NODE_ENV == "production") {
+if (cluster.isPrimary && process.env.NODE_ENV == "production") {
 	console.log(`Primary ${process.pid} is running`);
 
 	// Fork workers.

src/bundle/start.ts

@@ -17,7 +17,7 @@ try {
 	console.log("[API] Failed to get thread count! Using 1...");
 }
 
-if (cluster.isMaster) {
+if (cluster.isPrimary) {
 	function getCommitOrFail() {
 		try {
 			return execSync("git rev-parse HEAD").toString().trim();