Bump handlebars in /solutions/ModernSearch/react-search-refiners/spfx (#438)

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.4.3 to 4.5.3.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.4.3...v4.5.3)

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

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

Author: dependabot[bot]

solutions/ModernSearch/react-search-refiners/spfx/package-lock.json

@@ -36,7 +36,7 @@
         "downshift": "3.1.5",
         "flickity": "^2.2.1",
         "flickity-imagesloaded": "^2.0.0",
-        "handlebars": "4.4.3",
+        "handlebars": "4.5.3",
         "handlebars-group-by": "^1.0.1",
         "handlebars-helpers": "0.8.4",
         "immutability-helper": "2.4.0",