Bump handlebars from 4.0.12 to 4.7.3 in /src/app-engine/create-react-app

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.0.12 to 4.7.3. - [Release notes](https://github.com/wycats/handlebars.js/releases) - [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md) - [Commits](handlebars-lang/handlebars.js@v4.0.12...v4.7.3) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/app-engine/create-react-app/yarn.lock

@@ -1134,7 +1134,7 @@ async@^1.5.2:
  version "1.5.2"
  resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
 
-async@^2.1.4, async@^2.5.0:
+async@^2.1.4:
  version "2.6.1"
  resolved "https://registry.yarnpkg.com/async/-/async-2.6.1.tgz#b245a23ca71930044ec53fa46aa00a3e87c6a610"
  dependencies:
@@ -1940,6 +1940,10 @@ commander@~2.13.0:
  version "2.13.0"
  resolved "https://registry.yarnpkg.com/commander/-/commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
 
+commander@~2.20.3:
+ version "2.20.3"
+ resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
+
 common-tags@^1.4.0:
  version "1.8.0"
  resolved "https://registry.yarnpkg.com/common-tags/-/common-tags-1.8.0.tgz#8e3153e542d4a39e9b10554434afaaf98956a937"
@@ -3577,10 +3581,10 @@ handle-thing@^1.2.5:
  resolved "https://registry.yarnpkg.com/handle-thing/-/handle-thing-1.2.5.tgz#fd7aad726bf1a5fd16dfc29b2f7a6601d27139c4"
 
 handlebars@^4.0.3:
- version "4.0.12"
- resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.0.12.tgz#2c15c8a96d46da5e266700518ba8cb8d919d5bc5"
+ version "4.7.3"
+ resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.3.tgz#8ece2797826886cf8082d1726ff21d2a022550ee"
  dependencies:
- async "^2.5.0"
+ neo-async "^2.6.0"
  optimist "^0.6.1"
  source-map "^0.6.1"
  optionalDependencies:
@@ -5340,9 +5344,9 @@ negotiator@0.6.1:
  version "0.6.1"
  resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
 
-neo-async@^2.5.0:
- version "2.6.0"
- resolved "https://registry.yarnpkg.com/neo-async/-/neo-async-2.6.0.tgz#b9d15e4d71c6762908654b5183ed38b753340835"
+neo-async@^2.5.0, neo-async@^2.6.0:
+ version "2.6.1"
+ resolved "https://registry.yarnpkg.com/neo-async/-/neo-async-2.6.1.tgz#ac27ada66167fa8849a6addd837f6b189ad2081c"
 
 nice-try@^1.0.4:
  version "1.0.5"
@@ -6695,14 +6699,14 @@ react-dev-utils@^6.1.1:
  strip-ansi "4.0.0"
  text-table "0.2.0"
 
-react-dom@16.6.3:
- version "16.6.3"
- resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.6.3.tgz#8fa7ba6883c85211b8da2d0efeffc9d3825cccc0"
+react-dom@^16.6.3:
+ version "16.13.0"
+ resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.13.0.tgz#cdde54b48eb9e8a0ca1b3dc9943d9bb409b81866"
  dependencies:
  loose-envify "^1.1.0"
  object-assign "^4.1.1"
  prop-types "^15.6.2"
- scheduler "^0.11.2"
+ scheduler "^0.19.0"
 
 react-error-overlay@^5.1.0:
  version "5.1.0"
@@ -6762,14 +6766,13 @@ react-scripts@2.1.1:
  optionalDependencies:
  fsevents "1.2.4"
 
-react@16.6.3:
- version "16.6.3"
- resolved "https://registry.yarnpkg.com/react/-/react-16.6.3.tgz#25d77c91911d6bbdd23db41e70fb094cc1e0871c"
+react@^16.6.3:
+ version "16.13.0"
+ resolved "https://registry.yarnpkg.com/react/-/react-16.13.0.tgz#d046eabcdf64e457bbeed1e792e235e1b9934cf7"
  dependencies:
  loose-envify "^1.1.0"
  object-assign "^4.1.1"
  prop-types "^15.6.2"
- scheduler "^0.11.2"
 
 read-pkg-up@^1.0.1:
  version "1.0.1"
@@ -7155,9 +7158,9 @@ saxes@^3.1.3:
  dependencies:
  xmlchars "^1.3.1"
 
-scheduler@^0.11.2:
- version "0.11.2"
- resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.11.2.tgz#a8db5399d06eba5abac51b705b7151d2319d33d3"
+scheduler@^0.19.0:
+ version "0.19.0"
+ resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.19.0.tgz#a715d56302de403df742f4a9be11975b32f5698d"
  dependencies:
  loose-envify "^1.1.0"
  object-assign "^4.1.1"
@@ -7890,13 +7893,20 @@ uglify-es@^3.3.4:
  commander "~2.13.0"
  source-map "~0.6.1"
 
-uglify-js@3.4.x, uglify-js@^3.1.4:
+uglify-js@3.4.x:
  version "3.4.9"
  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.4.9.tgz#af02f180c1207d76432e473ed24a28f4a782bae3"
  dependencies:
  commander "~2.17.1"
  source-map "~0.6.1"
 
+uglify-js@^3.1.4:
+ version "3.8.0"
+ resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.8.0.tgz#f3541ae97b2f048d7e7e3aa4f39fd8a1f5d7a805"
+ dependencies:
+ commander "~2.20.3"
+ source-map "~0.6.1"
+
 uglifyjs-webpack-plugin@^1.2.4:
  version "1.3.0"
  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.3.0.tgz#75f548160858163a08643e086d5fefe18a5d67de"