Bump ember-cli-clipboard from 0.12.0 to 0.15.0

Bumps [ember-cli-clipboard](https://github.com/jkusa/ember-cli-clipboard) from 0.12.0 to 0.15.0.
- [Release notes](https://github.com/jkusa/ember-cli-clipboard/releases)
- [Commits](jkusa/ember-cli-clipboard@v0.12.0...v0.15.0)

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

Author: dependabot-preview[bot]

package.json

@@ -32,7 +32,7 @@
     "broccoli-rollup": "^4.1.1",
     "broccoli-stew": "^2.0.0",
     "ember-cli-babel": "^7.11.0",
-    "ember-cli-clipboard": "^0.12.0",
+    "ember-cli-clipboard": "^0.15.0",
     "ember-cli-htmlbars": "^2.0.1",
     "ember-cli-string-utils": "^1.1.0",
     "ember-composable-helpers": "^2.3.1",