fix: http proxy

Author: jevantang

src/Commands/PluginComposerUpdateCommand.php

@@ -22,10 +22,10 @@ public function handle()
         $httpProxy = config('app.http_proxy');
 
         $process = Process::run(<<<"SHELL"
-            export httpProxy=$httpProxy
+            export http_proxy=$httpProxy https_proxy=$httpProxy
             echo "Owner:" `whoami`
             echo "Path:" \$PATH
-            echo "Proxy:" \$httpProxy
+            echo "Proxy:" \$http_proxy
             echo ""
             echo `which php`
             echo `php -v`