test: use different ports for each test to avoid already in use errors

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---

Author: Planeshifter

lib/node_modules/@stdlib/net/disposable-http-server/test/test.main.js

@@ -171,7 +171,7 @@ tape( 'if only provided JavaScript, the server serves an HTML boilerplate and th
 	var flg;
 
 	opts = {
-		'port': 7331,
+		'port': 7332,
 		'address': '127.0.0.1',
 		'javascript': 'console.log("Beep");'
 	};
@@ -251,7 +251,7 @@ tape( 'if provided HTML and JavaScript, the server serves the HTML and then the
 	var flg;
 
 	opts = {
-		'port': 7331,
+		'port': 7333,
 		'address': '127.0.0.1',
 		'html': '<script src="/bundle.js"></script>',
 		'javascript': 'console.log("Beep");'
@@ -329,7 +329,7 @@ tape( 'if a client only requests JavaScript, the server serves the JavaScript an
 	var flg;
 
 	opts = {
-		'port': 7331,
+		'port': 7334,
 		'address': '127.0.0.1',
 		'javascript': 'console.log("Beep");'
 	};
@@ -385,7 +385,7 @@ tape( 'if the server receives a request for something other than the JavaScript
 	var opts;
 
 	opts = {
-		'port': 7331,
+		'port': 7335,
 		'address': '127.0.0.1',
 		'html': '<h1>Beep</h1>'
 	};
@@ -431,7 +431,7 @@ tape( 'if the server receives a request while closing, the server returns a `503
 	var opts;
 
 	opts = {
-		'port': 7331,
+		'port': 7336,
 		'address': '127.0.0.1',
 		'html': 'Beep!'
 	};
@@ -506,7 +506,7 @@ tape( 'the function accepts `Buffer` objects for both HTML and JavaScript', func
 	var flg;
 
 	opts = {
-		'port': 7331,
+		'port': 7337,
 		'address': '127.0.0.1',
 		'html': string2buffer( '<script src="/bundle.js"></script>' ),
 		'javascript': string2buffer( 'console.log("Beep");' )
@@ -589,7 +589,7 @@ tape( 'the server will close any persistent connections on close', function test
 	});
 
 	opts = {
-		'port': 7331,
+		'port': 7338,
 		'address': '127.0.0.1',
 		'html': '<h1>Beep</h1>'
 	};
@@ -648,7 +648,7 @@ tape( 'if the `open` option is `true`, the function will attempt to open the con
 	var flg;
 
 	opts = {
-		'port': 7331,
+		'port': 7339,
 		'address': '127.0.0.1',
 		'html': '<h1>Beep</h1>',
 		'open': true