BF: indi-s3 credentials

[loj]

The datalad-test-s3 credentials are configured as the default for indi-s3, which prevents the ability to connect anonymously. This change fixes #5038

[yarikoptic]

thanks! but you should have started from maint branch. The easiest way imho would be to close this PR, then

git fetch origin
git checkout -b bf-indis3-credentials2 origin/maint
git cherry-pick bf-indis3-credentials
git branch -D bf-indis3-credentials

and then submit a PR ;) of cause there is also without closing this PR but "fixing it up":

git checkout bf-indis3-credentials
git fetch origin
git  reset --hard origin/maint
git cherry-pick 014d0c418699217fdddd47577f30fbd7af28ae06
git push -f

and of cause there is also git rebase but I will leave that one out for now ;)

[loj]

Oops, sorry about that. Thanks for the instructions for fixing it up. :-) I think it's right now.

[codecov]

Codecov Report

Merging #5045 into maint will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            maint    #5045   +/-   ##
=======================================
  Coverage   89.93%   89.93%           
=======================================
  Files         292      292           
  Lines       40756    40756           
=======================================
  Hits        36652    36652           
  Misses       4104     4104           

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