chore(deps): update dependency sigstore/cosign to v1.13.6

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
sigstore/cosign	patch	v1.13.2 -> v1.13.6

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Release Notes

sigstore/cosign (sigstore/cosign)

### [`v1.13.6`](https://togithub.com/sigstore/cosign/releases/tag/v1.13.6) [Compare Source](https://togithub.com/sigstore/cosign/compare/v1.13.2...v1.13.6) #### What's Changed - V1 go tuf update in [https://github.com/sigstore/cosign/pull/3598](https://togithub.com/sigstore/cosign/pull/3598) #### CI workflow fixes - Update cloud build script to latest for v1.13.x in [https://github.com/sigstore/cosign/pull/3615](https://togithub.com/sigstore/cosign/pull/3615) - 1.13.x release: Fix spacing in [https://github.com/sigstore/cosign/pull/3617](https://togithub.com/sigstore/cosign/pull/3617) - release 1.13.x: fix goreleaser in [https://github.com/sigstore/cosign/pull/3619](https://togithub.com/sigstore/cosign/pull/3619) **Full Changelog**: https://github.com/sigstore/cosign/compare/v1.13.2...v1.13.6

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