fix(@angular-devkit/core): update ajv to 6.12.3

Fixes security notice https://snyk.io/vuln/SNYK-JS-AJV-584908

Closes: #18308

package.json

@@ -101,7 +101,7 @@
     "@types/webpack-dev-server": "^3.1.7",
     "@types/webpack-sources": "^0.1.5",
     "@yarnpkg/lockfile": "1.1.0",
-    "ajv": "6.12.0",
+    "ajv": "6.12.3",
     "ansi-colors": "4.1.1",
     "common-tags": "^1.8.0",
     "conventional-changelog": "^3.0.0",

packages/angular_devkit/build_angular/package.json

@@ -17,7 +17,7 @@
     "@babel/template": "7.8.6",
     "@jsdevtools/coverage-istanbul-loader": "3.0.3",
     "@ngtools/webpack": "0.0.0",
-    "ajv": "6.12.0",
+    "ajv": "6.12.3",
     "autoprefixer": "9.7.4",
     "babel-loader": "8.0.6",
     "browserslist": "^4.9.1",

packages/angular_devkit/core/package.json

@@ -8,7 +8,7 @@
     "core"
   ],
   "dependencies": {
-    "ajv": "6.12.0",
+    "ajv": "6.12.3",
     "fast-json-stable-stringify": "2.1.0",
     "magic-string": "0.25.7",
     "rxjs": "6.5.4",

yarn.lock

@@ -2003,10 +2003,10 @@ ajv-keywords@^3.1.0, ajv-keywords@^3.4.1:
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-3.4.1.tgz#ef916e271c64ac12171fd8384eaae6b2345854da"
   integrity sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ==
 
-ajv@6.12.0:
-  version "6.12.0"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.12.0.tgz#06d60b96d87b8454a5adaba86e7854da629db4b7"
-  integrity sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==
+ajv@6.12.3:
+  version "6.12.3"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.12.3.tgz#18c5af38a111ddeb4f2697bd78d68abc1cabd706"
+  integrity sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==
   dependencies:
     fast-deep-equal "^3.1.1"
     fast-json-stable-stringify "^2.0.0"