7.x.x: Remove EventLoop from Credential Provider context

[codecov[bot]]

Codecov Report

Merging #557 (4ec3b49) into 7.x.x (e9bf08c) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            7.x.x     #557      +/-   ##
==========================================
- Coverage   71.54%   71.53%   -0.01%     
==========================================
  Files          76       76              
  Lines        7847     7846       -1     
==========================================
- Hits         5614     5613       -1     
  Misses       2233     2233              

Impacted Files	Coverage Δ
Sources/SotoCore/AWSClient.swift	81.50% <ø> (-0.05%)	:arrow_down:
...urces/SotoCore/Credential/CredentialProvider.swift	98.63% <ø> (ø)
Sources/SotoCore/Credential/ConfigFileLoader.swift	99.46% <100.00%> (ø)

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