Bump shortcut-buttons-flatpickr from 0.3.1 to 0.4.0

Bumps [shortcut-buttons-flatpickr](https://github.com/jcsmorais/shortcut-buttons-flatpickr) from 0.3.1 to 0.4.0.
- [Release notes](https://github.com/jcsmorais/shortcut-buttons-flatpickr/releases)
- [Commits](https://github.com/jcsmorais/shortcut-buttons-flatpickr/compare/0.3.1...0.4.0)

---
updated-dependencies:
- dependency-name: shortcut-buttons-flatpickr
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -37,7 +37,7 @@
     "moment": "^2.29.1",
     "mrujs": "^0.7.4",
     "select2": "^4.0.13",
-    "shortcut-buttons-flatpickr": "^0.3.1",
+    "shortcut-buttons-flatpickr": "^0.4.0",
     "stimulus": "^2.0.0",
     "webpack": "~4",
     "webpack-cli": "~3"