chore(deps): update sigstore/cosign-installer digest to 9c520b9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sigstore/cosign-installer	action	digest	ef6a6b3 -> 9c520b9

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[netlify]

✅ Deploy Preview for polite-licorice-3db33c canceled.

Name	Link
🔨 Latest commit	71d4c77
🔍 Latest deploy log	https://app.netlify.com/sites/polite-licorice-3db33c/deploys/65113722d612450008fa9207

[codecov]

Codecov Report

Merging #935 (71d4c77) into main (a2a2c3c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #935   +/-   ##
=======================================
  Coverage   72.62%   72.62%           
=======================================
  Files          28       28           
  Lines        2857     2857           
=======================================
  Hits         2075     2075           
  Misses        685      685           
  Partials       97       97           

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