Update sponsorship logos to support dark theme on Github

[noel]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a3a276c) 100.00% compared to head (9059dc1) 100.00%.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main      #130   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         2194      2206   +12     
  Branches       272       272           
=========================================
+ Hits          2194      2206   +12     

Impacted Files	Coverage Δ
dbt_checkpoint/check_script_has_no_table_name.py	100.00% <ø> (ø)
dbt_checkpoint/tracking.py	100.00% <100.00%> (ø)
dbt_checkpoint/utils.py	100.00% <100.00%> (ø)

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[JFrackson]

lgtm. Montreal Analytics is also starting to use the Datatonic name and logo for things so let me ask about that before adding our own dark version.