chore: updated copyright

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 55.33%. Comparing base (6424f52) to head (2afa1a3). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #255 +/- ## ======================================= Coverage 55.33% 55.33% ======================================= Files 54 54 Lines 2335 2335 ======================================= Hits 1292 1292 Misses 1015 1015 Partials 28 28 ``` | [Flag](https://app.codecov.io/gh/xmidt-org/themis/pull/255/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xmidt-org) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/xmidt-org/themis/pull/255/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xmidt-org) | `55.33% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xmidt-org#carryforward-flags-in-the-pull-request-comment) to find out more.

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