Update sigstore/cosign-installer action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sigstore/cosign-installer	action	major	v3.10.1 → v4.1.2

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Release Notes

sigstore/cosign-installer (sigstore/cosign-installer)

v4.1.2

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What's Changed

• Bump cosign to 3.0.6 in #​232

v4.1.1

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What's Changed

• chore: update default cosign-release to v3.0.5 in #​223

Full Changelog: sigstore/cosign-installer@v4.1.0...v4.1.1

v4.1.0

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What's Changed

We recommend updating as soon as possible as this includes bug fixes for Cosign. We also recommend removing with: cosign-release and strongly discourage using cosign-release unless you have a specific reason to use an older version of Cosign.

• Bump cosign to 3.0.5 in #​220
• fix: add retry to curl downloads for transient network failures in #​210

Full Changelog: sigstore/cosign-installer@v4.0.0...v4.1.0

v4.0.0

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What's Changed?

Note: You must upgrade to cosign-installer v4 if you want to install Cosign v3+. You may still install Cosign v2.x with cosign-installer v4.

In version v3+, using cosign sign-blob requires adding the --bundle flag which may require you to update your signing command.

• Add support for Cosign v3 releases (#​201)

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