Bump handlebars from 4.7.4 to 4.7.6

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.4 to 4.7.6.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.4...v4.7.6)

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Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "debounce": "^1.2.0",
     "dompurify": "^2.0.8",
     "escape-html": "^1.0.3",
-    "handlebars": "^4.7.4",
+    "handlebars": "^4.7.6",
     "jcrop": "git+https://github.com/ChristophWurst/Jcrop.git#v0.9.12-npm3",
     "jquery": "2.1.4",
     "jquery-migrate": "^1.4.1",