fix(@angular-devkit/build-angular): rollback sass to version 1.22.7

sass version `1.22.8` was rolled back and is no longer available on NPM

Author: alan-agius4

packages/angular_devkit/build_angular/package.json

@@ -37,7 +37,7 @@
     "postcss-loader": "3.0.0",
     "raw-loader": "1.0.0",
     "rxjs": "6.4.0",
-    "sass": "1.22.8",
+    "sass": "1.22.7",
     "sass-loader": "7.1.0",
     "semver": "6.3.0",
     "source-map-support": "0.5.12",

yarn.lock

@@ -9147,10 +9147,10 @@ [email protected]:
     pify "^3.0.0"
     semver "^5.5.0"
 
-[email protected].8:
-  version "1.22.8"
-  resolved "https://registry.yarnpkg.com/sass/-/sass-1.22.8.tgz#835178085177d5a934fb0e25a0f958b4b5bbff65"
-  integrity sha512-5md/TfquFCQw+Wp9/FoQuEolVuVsJJZ6dQjfCRihCYcyr8xoQICIU0Nads9CVH8z9khd7k8AnwCcgH6L7t+SAg==
+[email protected].7:
+  version "1.22.7"
+  resolved "https://registry.yarnpkg.com/sass/-/sass-1.22.7.tgz#5a1a77dc11aa659db4e782d238bf9f3d44a60546"
+  integrity sha512-ahREi0AdG7RTovSv14+yd1prQSfIvFcrDpOsth5EQf1+RM7SvOxsSttzNQaFmK1aa/k/3vyYwlYF5l0Xl+6c+g==
   dependencies:
     chokidar ">=2.0.0 <4.0.0"