refactor: remove devDependency safe-buffer (#547)

Author: Phillip9587

package.json

@@ -30,7 +30,6 @@
     "eslint-plugin-standard": "4.1.0",
     "mocha": "10.2.0",
     "nyc": "15.1.0",
-    "safe-buffer": "5.2.1",
     "supertest": "6.3.3"
   },
   "files": [

test/json.js

@@ -2,7 +2,6 @@
 
 var assert = require('assert')
 var asyncHooks = tryRequire('async_hooks')
-var Buffer = require('safe-buffer').Buffer
 var http = require('http')
 var request = require('supertest')
 

test/raw.js

@@ -2,7 +2,6 @@
 
 var assert = require('assert')
 var asyncHooks = tryRequire('async_hooks')
-var Buffer = require('safe-buffer').Buffer
 var http = require('http')
 var request = require('supertest')
 

test/text.js

@@ -2,7 +2,6 @@
 
 var assert = require('assert')
 var asyncHooks = tryRequire('async_hooks')
-var Buffer = require('safe-buffer').Buffer
 var http = require('http')
 var request = require('supertest')
 

test/urlencoded.js

@@ -2,7 +2,6 @@
 
 var assert = require('assert')
 var asyncHooks = tryRequire('async_hooks')
-var Buffer = require('safe-buffer').Buffer
 var http = require('http')
 var request = require('supertest')