fix: remove logging of api key from TokenBasedAuthenticationExtension

[juliapampus]

What this PR changes/adds

Removes plain key from log line.

Why it does that

Password shouldn't be part of the log file

Further notes

--

Linked Issue(s)

Closes #1780

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• assigned appropriate label? (exclude from changelog with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[codecov-commenter]

Codecov Report

Merging #1788 (6b924ba) into main (a9b98b7) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1788      +/-   ##
==========================================
- Coverage   67.85%   67.85%   -0.01%     
==========================================
  Files         793      793              
  Lines       16838    16837       -1     
  Branches     1077     1077              
==========================================
- Hits        11426    11425       -1     
  Misses       4939     4939              
  Partials      473      473              

Impacted Files	Coverage Δ
...or/api/auth/TokenBasedAuthenticationExtension.java	90.00% <50.00%> (-10.00%)	⬇️
...iation/ProviderContractNegotiationManagerImpl.java	90.55% <0.00%> (+0.55%)	⬆️

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