Upgrade async-sema (vercel#6410)

Author: timneutkens

packages/next/package.json

@@ -51,7 +51,7 @@
     "@babel/runtime-corejs2": "7.1.2",
     "@babel/template": "7.1.2",
     "arg": "3.0.0",
-    "async-sema": "2.1.4",
+    "async-sema": "2.2.0",
     "autodll-webpack-plugin": "0.4.2",
     "babel-core": "7.0.0-bridge.0",
     "babel-loader": "8.0.2",

yarn.lock

@@ -2312,12 +2312,10 @@ async-retry@1.2.1:
   dependencies:
     retry "0.10.1"
 
-async-sema@2.1.4:
-  version "2.1.4"
-  resolved "https://registry.yarnpkg.com/async-sema/-/async-sema-2.1.4.tgz#3f5aa091d0a763354045ee899a5d17ffb69251af"
-  integrity sha512-NKdMgXT9RfmkscybzytzK/6uGF4cL8Mt3PSeO9QHXYKs3oFWkUwIepnAkzLWkqttOdDDFoED3c8kriS8RzP+ow==
-  dependencies:
-    double-ended-queue "2.1.0-0"
+async-sema@2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/async-sema/-/async-sema-2.2.0.tgz#b0de2bb11a2560d369aca975d24650cc05304979"
+  integrity sha512-bI/JChXscebgVmAwTk+EQF4LIr4Hy6W5+B2AG1I9CmkfABmFEYyRrJGutfc816/Hd6LRzHFxpjGqZ/idwhJpRg==
 
 async@2.0.1:
   version "2.0.1"
@@ -4396,11 +4394,6 @@ dot-prop@^4.1.0, dot-prop@^4.1.1, dot-prop@^4.2.0:
   dependencies:
     is-obj "^1.0.0"
 
-double-ended-queue@2.1.0-0:
-  version "2.1.0-0"
-  resolved "https://registry.yarnpkg.com/double-ended-queue/-/double-ended-queue-2.1.0-0.tgz#103d3527fd31528f40188130c841efdd78264e5c"
-  integrity sha1-ED01J/0xUo9AGIEwyEHv3XgmTlw=
-
 duplexer3@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"