Use `license-maven-plugin` Apache license 2.0 bundled header

[scordio]

[!NOTE]
Waiting for the release of license-maven-plugin 4.6.

Relates to mathieucarbou/license-maven-plugin#532, fixes #3017.

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[scordio]

Spotless complains about the formatting of the new license headers:

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,

It might make sense to look into the Spotless native support for license headers, thus removing the license-maven-plugin.