add Raku icon

[ignamartinoli]

• I have searched the issues for my request and found nothing related and/or helpful
• I have searched the FAQ for help
• I have searched the Wiki for help

Is your feature request related to a problem? Please describe.

It would be nice to have a Raku icon

Describe the solution you'd like

The addition of a Raku icon

Describe alternatives you've considered

None

Additional context

This is the official Raku mascot

[ignamartinoli]

Now it's properly filled

[Finii]

Closing because transferred to #1095

[github-actions]

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