Modify FUNDING.yml to include Geuthur

[Geuthur]

Updated funding model with Geuthur's usernames.

Description

Please include a summary of the changes and the related issue number (if applicable).

Type of Changes

Please select the type of changes made in this pull request:

• Bug Fix (non-breaking change which fixes an Issue)
• New Feature (non-breaking change)
• Other (please specify):

Checklist

Please ensure the following before submitting your pull request:

• I have read the contributing guidelines.
• My code follows the code style of this project.
• I have performed a self-review of my code.
• I have commented my code where necessary.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   68.78%   68.78%           
=======================================
  Files          32       32           
  Lines        1441     1441           
  Branches      136      136           
=======================================
  Hits          991      991           
  Misses        406      406           
  Partials       44       44           

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