Upgrade node-sass for node 12 compatibility

Some dependencies have incompatibilities with Node v12, which will
become LTS in October. Namely node-sass and needed to be forwarded in
order for their native extensions to compile without errors.

changelogs/unreleased/leipert-node-12-compatibility.yml

+---
+title: Upgrade dependencies for node 12 compatibility
+merge_request: 28323
+author:
+type: fixed

package.json

@@ -182,7 +182,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^4.0.0-beta.0",
     "md5": "^2.2.1",
-    "node-sass": "^4.11.0",
+    "node-sass": "^4.12.0",
     "nodemon": "^1.18.9",
     "pixelmatch": "^4.0.2",
     "postcss": "^7.0.14",

yarn.lock

@@ -6731,17 +6731,12 @@ locate-path@^3.0.0:
     p-locate "^3.0.0"
     path-exists "^3.0.0"
 
-lodash.assign@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
-  integrity sha1-DZnzzNem0mHRm9rrkkUAXShYCOc=
-
 lodash.camelcase@4.3.0:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/lodash.camelcase/-/lodash.camelcase-4.3.0.tgz#b28aa6288a2b9fc651035c7711f65ab6190331a6"
   integrity sha1-soqmKIorn8ZRA1x3EfZathkDMaY=
 
-lodash.clonedeep@^4.3.2, lodash.clonedeep@^4.5.0:
+lodash.clonedeep@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
   integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
@@ -7310,10 +7305,10 @@ mute-stream@0.0.7:
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
   integrity sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=
 
-nan@^2.10.0, nan@^2.9.2:
-  version "2.13.1"
-  resolved "https://registry.yarnpkg.com/nan/-/nan-2.13.1.tgz#a15bee3790bde247e8f38f1d446edcdaeb05f2dd"
-  integrity sha512-I6YB/YEuDeUZMmhscXKxGgZlFnhsn5y0hgOZBadkzfTRrZBtJDZeg6eQf7PYMIEclwmorTKK8GztsyOUSVBREA==
+nan@^2.13.2, nan@^2.9.2:
+  version "2.13.2"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.13.2.tgz#f51dc7ae66ba7d5d55e1e6d4d8092e802c9aefe7"
+  integrity sha512-TghvYc72wlMGMVMluVo9WRJc0mB8KxxF/gZ4YYFy7V2ZQX9l7rgbPg7vjS9mt6U5HXODVFVI2bOduCzwOMv/lw==
 
 nanomatch@^1.2.9:
   version "1.2.9"
@@ -7465,10 +7460,10 @@ node-releases@^1.1.3:
   dependencies:
     semver "^5.3.0"
 
-node-sass@^4.11.0:
-  version "4.11.0"
-  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.11.0.tgz#183faec398e9cbe93ba43362e2768ca988a6369a"
-  integrity sha512-bHUdHTphgQJZaF1LASx0kAviPH7sGlcyNhWade4eVIpFp6tsn7SV8xNMTbsQFpEV9VXpnwTTnNYlfsZXgGgmkA==
+node-sass@^4.12.0:
+  version "4.12.0"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.12.0.tgz#0914f531932380114a30cc5fa4fa63233a25f017"
+  integrity sha512-A1Iv4oN+Iel6EPv77/HddXErL2a+gZ4uBeZUy+a8O35CFYTXhgA8MgLCWBtwpGZdCvTvQ9d+bQxX/QC36GDPpQ==
   dependencies:
     async-foreach "^0.1.3"
     chalk "^1.1.1"
@@ -7477,12 +7472,10 @@ node-sass@^4.11.0:
     get-stdin "^4.0.1"
     glob "^7.0.3"
     in-publish "^2.0.0"
-    lodash.assign "^4.2.0"
-    lodash.clonedeep "^4.3.2"
-    lodash.mergewith "^4.6.0"
+    lodash "^4.17.11"
     meow "^3.7.0"
     mkdirp "^0.5.1"
-    nan "^2.10.0"
+    nan "^2.13.2"
     node-gyp "^3.8.0"
     npmlog "^4.0.0"
     request "^2.88.0"