Bump lodash from 4.17.19 to 4.17.20 (#484)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.19 to 4.17.20.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.19...4.17.20)

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
         "history": "5.0.0",
         "i18n-iso-countries": "4.3.1",
         "is-valid-fodselsnummer": "3.0.5",
-        "lodash": "4.17.19",
+        "lodash": "4.17.20",
         "morgan": "^1.9.1",
         "nav-datovelger": "1.1.10",
         "nav-frontend-alertstriper": "^3.0.4",