Bump knex from 0.15.2 to 0.19.5

Bumps [knex](https://github.com/tgriesser/knex) from 0.15.2 to 0.19.5.
- [Release notes](https://github.com/tgriesser/knex/releases)
- [Changelog](https://github.com/knex/knex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tgriesser/knex/compare/0.15.2...0.19.5)

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

package.json

@@ -49,7 +49,7 @@
     "html-entities": "^1.2.1",
     "json-schema-ref-parser": "^5.0.3",
     "jsonwebtoken": "^8.3.0",
-    "knex": "^0.15.2",
+    "knex": "^0.19.5",
     "liquidjs": "^5.1.1",
     "lodash": "^4.17.10",
     "moment": "^2.22.2",