Bump lodash from 4.17.15 to 4.17.19 in /src/IdentityManager2

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.15...4.17.19)

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

Author: dependabot[bot]

src/IdentityManager2/package-lock.json

@@ -7,6 +7,6 @@
     "gulp-clean-css": "4.2.0",
     "gulp-concat": "2.6.1",
     "gulp-less": "4.0.1",
-    "lodash": "^4.17.15"
+    "lodash": "^4.17.19"
   }
 }