Change Details

Original script: ``` -BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./src/bench/ ./contrib/devtools/copyright_header.py update ./src/test/ -END VERIFY SCRIPT- ``` Partial backport of core PR15788: https://github.com/bitcoin/bitcoin/pull/15788/commits/faf400077d0144363c2dd24187431d958fb149a9 Bench files only for ease of review.

Original script: ``` -BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./src/bench/ ./contrib/devtools/copyright_header.py update ./src/test/ -END VERIFY SCRIPT- ``` Partial backport of core [[https://github.com/bitcoin/bitcoin/pull/15788 | PR15788]]: https://github.com/bitcoin/bitcoin/pull/15788/commits/faf400077d0144363c2dd24187431d958fb149a9 Bench files only for ease of review.

Original script: ``` -BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./src/bench/ ./contrib/devtools/copyright_header.py update ./src/test/ -END VERIFY SCRIPT- ``` Partial backport of core [[https://github.com/bitcoin/bitcoin/pull/15788 | PR15788:]]: https://github.com/bitcoin/bitcoin/pull/15788/commits/faf400077d0144363c2dd24187431d958fb149a9 Bench files only for ease of review.