Update Cosign required tests

[Hayden-IO]

Updating the tested k8s versions to ones that aren't EoL

Summary

Release Note

Documentation

[github-actions]

🍹 preview on sigstore-github-sync/sigstore/github-prod

Pulumi report

View in Pulumi Cloud

  Previewing update (github-prod)

View Live: https://app.pulumi.com/sigstore/sigstore-github-sync/github-prod/previews/7be0aec8-22c8-457c-b828-372981ae84e2

@ Previewing update.....
pulumi:pulumi:Stack: (same)
  [urn=urn:pulumi:github-prod::sigstore-github-sync::pulumi:pulumi:Stack::sigstore-github-sync-github-prod]
  ~ github:index/branchProtection:BranchProtection: (update)
      [id=BPR_kwDOFAY6Ic4DA1Fw]
      [urn=urn:pulumi:github-prod::sigstore-github-sync::github:index/branchProtection:BranchProtection::cosign-main]
      [provider=urn:pulumi:github-prod::sigstore-github-sync::pulumi:providers:github::default_6_12_1::931ee8ca-84e9-4841-95d3-e7a92f3f6dc9]
    ~ requiredStatusChecks: [
        ~ [0]: {
                ~ contexts: [
                    - [10]: "attest / verify-attestation test (v1.30.x, air-gap)"
                    - [11]: "attest / verify-attestation test (v1.30.x, remote)"
                    + [13]: "attest / verify-attestation test (v1.33.x, remote)"
                    + [14]: "attest / verify-attestation test (v1.33.x, air-gap)"
                    + [15]: "attest / verify-attestation test (v1.34.x, remote)"
                    + [16]: "attest / verify-attestation test (v1.34.x, air-gap)"
                    + [17]: "attest / verify-attestation test (v1.35.x, remote)"
                    + [18]: "attest / verify-attestation test (v1.35.x, air-gap)"
                  ]
              }
      ]
@ Previewing update....
@ Previewing update....
Resources:
  ~ 1 to update
  629 unchanged