remove double quotes, looks like it is passing as a single string to cosign and not as an array

[cpanato]

Summary

• ko now output more digests (before 0.11.2 release the output was just one) and that was passing as a unique big string to cosign failing the job

ran the fix here: https://github.com/cpanato/cosign/actions/runs/2950002823

[codecov-commenter]

Codecov Report

Merging #2205 (8b05d40) into main (31e6654) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 8b05d40 differs from pull request most recent head cf41f1a. Consider uploading reports for the commit cf41f1a to get more accurate results

@@            Coverage Diff             @@
##             main    #2205      +/-   ##
==========================================
- Coverage   26.51%   26.51%   -0.01%     
==========================================
  Files         131      131              
  Lines        7670     7671       +1     
==========================================
  Hits         2034     2034              
- Misses       5375     5376       +1     
  Partials      261      261              

Impacted Files	Coverage Δ
cmd/cosign/cli/options/registry.go	0.00% <0.00%> (ø)

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