chore(repo): add missing newline to copyright template

[christoph-jerolimov]

Hey, I just made a Pull Request!

The copyright template should contain a newline at the end, otherwise the added copyright comment will share the same line as the first code (mostly TS import).

See:

rhdh-plugins/workspaces/bulk-import/plugins/bulk-import/src/plugin.ts

Lines 13 to 18 in cc01186

	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/ import {
	configApiRef,
	createApiFactory,
	createComponentExtension,

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)