Update copyright to 2023

[Neustradamus]

Dear ProcessOne team, @badlop,

I wish you a Happy New Year!

Like previously, can you update the copyright in ProcessOne projects to 2023?

• 2022: https://github.com/processone/ejabberd/issues/3749
• 2021: https://github.com/processone/ejabberd/issues/3464
• 2020: https://github.com/processone/ejabberd/issues/3149
• 2019: https://github.com/processone/ejabberd/issues/2756
• 2017: https://github.com/processone/ejabberd/issues/1442
• 2016: https://github.com/processone/ejabberd/issues/901

Thanks in advance.

[badlop]

Command to execute (as seen in https://github.com/processone/ejabberd/issues/2756): find ./* -type f \! -regex ".*git.*" -exec sed -i 's/-202./-2023/g' {} \;

Projects dates are only updated when they will have a new release. If there isn't a release, no need to update.