build(deps): bump lodash from 4.17.15 to 4.17.19

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

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

package.json

@@ -49,7 +49,7 @@
     "koa-router": "7.4.0",
     "koa-session": "5.12.3",
     "koa-static": "5.0.0",
-    "lodash": "4.17.15",
+    "lodash": "4.17.19",
     "markdown-to-jsx": "^6.11.4",
     "mockjs": "1.1.0",
     "moment": "2.24.0",