Update dependency ember-bootstrap to v6 (#85)

* Update dependency ember-bootstrap to v6

* Ember Bootstrap v6 does not support Ember 3.28

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jeldrik Hanschke <admin@jhanschke.de>

Author: renovate[bot]

package.json

@@ -49,7 +49,7 @@
     "broccoli-asset-rev": "3.0.0",
     "concurrently": "8.2.2",
     "ember-auto-import": "2.10.1",
-    "ember-bootstrap": "5.1.1",
+    "ember-bootstrap": "6.5.0",
     "ember-changeset": "4.2.0",
     "ember-changeset-validations": "5.0.0",
     "ember-cli": "4.12.3",