Bump lodash in /tutorials/appengine-nodejs-webpack (#1359)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.14 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.14...4.17.19)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tutorials/appengine-nodejs-webpack/yarn.lock

@@ -1213,13 +1213,9 @@ loader-utils@^0.2.16:
     json5 "^0.5.0"
     object-assign "^4.0.1"
 
-lodash@^4.14.0:
-  version "4.17.14"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.14.tgz#9ce487ae66c96254fe20b599f21b6816028078ba"
-
-lodash@^4.17.4:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
+lodash@^4.14.0, lodash@^4.17.4:
+  version "4.17.19"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
 
 longest@^1.0.1:
   version "1.0.1"