Upgrade to webpack with latest acorns (#7795)

Closes #6240

packages/next/package.json

@@ -97,7 +97,7 @@
     "unfetch": "4.1.0",
     "url": "0.11.0",
     "watchpack": "2.0.0-beta.5",
-    "webpack": "4.32.2",
+    "webpack": "4.35.3",
     "webpack-dev-middleware": "3.7.0",
     "webpack-hot-middleware": "2.25.0",
     "webpack-sources": "1.3.0",

yarn.lock

@@ -2248,11 +2248,6 @@ accepts@~1.3.7:
     mime-types "~2.1.24"
     negotiator "0.6.2"
 
-acorn-dynamic-import@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz#482210140582a36b83c3e342e1cfebcaa9240948"
-  integrity sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==
-
 acorn-globals@^4.1.0:
   version "4.3.2"
   resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-4.3.2.tgz#4e2c2313a597fd589720395f6354b41cd5ec8006"
@@ -2276,11 +2271,16 @@ acorn@^5.5.3:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
   integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
 
-acorn@^6.0.1, acorn@^6.0.2, acorn@^6.0.5, acorn@^6.0.7:
+acorn@^6.0.1, acorn@^6.0.2, acorn@^6.0.7:
   version "6.1.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"
   integrity sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==
 
+acorn@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.0.tgz#67f0da2fc339d6cfb5d6fb244fd449f33cd8bbe3"
+  integrity sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==
+
 after-all-results@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/after-all-results/-/after-all-results-2.0.0.tgz#6ac2fc202b500f88da8f4f5530cfa100f4c6a2d0"
@@ -13061,17 +13061,16 @@ [email protected], webpack-sources@^1.0.1, webpack-sources@^1.1.0, webpack-s
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@4.32.2:
-  version "4.32.2"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.32.2.tgz#3639375364a617e84b914ddb2c770aed511e5bc8"
-  integrity sha512-F+H2Aa1TprTQrpodRAWUMJn7A8MgDx82yQiNvYMaj3d1nv3HetKU0oqEulL9huj8enirKi8KvEXQ3QtuHF89Zg==
+webpack@4.35.3:
+  version "4.35.3"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.35.3.tgz#66bc35ef215a7b75e8790f84d560013ffecf0ca3"
+  integrity sha512-xggQPwr9ILlXzz61lHzjvgoqGU08v5+Wnut19Uv3GaTtzN4xBTcwnobodrXE142EL1tOiS5WVEButooGzcQzTA==
   dependencies:
     "@webassemblyjs/ast" "1.8.5"
     "@webassemblyjs/helper-module-context" "1.8.5"
     "@webassemblyjs/wasm-edit" "1.8.5"
     "@webassemblyjs/wasm-parser" "1.8.5"
-    acorn "^6.0.5"
-    acorn-dynamic-import "^4.0.0"
+    acorn "^6.2.0"
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
     chrome-trace-event "^1.0.0"