chore(deps): update rekor-server to 9971ce2

[red-hat-konflux]

Image created from 'https://github.com/securesign/rekor?rev=e4f374733b962615ec8b804ac9f8fd0715f74e93'

This PR contains the following updates:

Package	Update	Change
quay.io/securesign/rekor-server	digest	112b536 -> 9971ce2

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.88%. Comparing base (e323208) to head (67fbf0b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2137      +/-   ##
==========================================
+ Coverage   56.85%   56.88%   +0.02%     
==========================================
  Files         281      281              
  Lines       15701    15701              
==========================================
+ Hits         8927     8931       +4     
+ Misses       5863     5861       -2     
+ Partials      911      909       -2     

Flag	Coverage Δ
e2e	70.12% <ø> (+0.05%)	⬆️
unit	34.83% <ø> (ø)

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