[Security] Bump acorn from 5.7.3 to 5.7.4

Bumps [acorn](https://github.com/acornjs/acorn) from 5.7.3 to 5.7.4. **This update includes a security fix.**
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@5.7.3...5.7.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

yarn.lock

@@ -2813,9 +2813,9 @@ acorn-walk@^6.0.1, acorn-walk@^6.1.1:
   integrity sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==
 
 acorn@^5.7.3:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
-  integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 acorn@^6.0.1, acorn@^6.0.7, acorn@^6.2.1:
   version "6.3.0"
@@ -16142,36 +16142,7 @@ webpack-sources@1.4.3, webpack-sources@^1.0.1, webpack-sources@^1.1.0, webpack-s
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@4.42.0:
-  version "4.42.0"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.42.0.tgz#b901635dd6179391d90740a63c93f76f39883eb8"
-  integrity sha512-EzJRHvwQyBiYrYqhyjW9AqM90dE4+s1/XtCfn7uWg6cS72zH+2VPFAlsnW0+W0cDi0XRjNKUMoJtpSi50+Ph6w==
-  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 "^6.2.1"
-    ajv "^6.10.2"
-    ajv-keywords "^3.4.1"
-    chrome-trace-event "^1.0.2"
-    enhanced-resolve "^4.1.0"
-    eslint-scope "^4.0.3"
-    json-parse-better-errors "^1.0.2"
-    loader-runner "^2.4.0"
-    loader-utils "^1.2.3"
-    memory-fs "^0.4.1"
-    micromatch "^3.1.10"
-    mkdirp "^0.5.1"
-    neo-async "^2.6.1"
-    node-libs-browser "^2.2.1"
-    schema-utils "^1.0.0"
-    tapable "^1.1.3"
-    terser-webpack-plugin "^1.4.3"
-    watchpack "^1.6.0"
-    webpack-sources "^1.4.1"
-
-webpack@^4.28.2, webpack@^4.41.0, webpack@^4.41.5:
+webpack@4.42.0, webpack@^4.28.2, webpack@^4.41.0, webpack@^4.41.5:
   version "4.42.0"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.42.0.tgz#b901635dd6179391d90740a63c93f76f39883eb8"
   integrity sha512-EzJRHvwQyBiYrYqhyjW9AqM90dE4+s1/XtCfn7uWg6cS72zH+2VPFAlsnW0+W0cDi0XRjNKUMoJtpSi50+Ph6w==