Bump github.com/tektoncd/chains from 0.26.2 to 0.26.3

[dependabot]

Bumps github.com/tektoncd/chains from 0.26.2 to 0.26.3.

Release notes

Sourced from github.com/tektoncd/chains's releases.

Tekton Chains release v0.26.3

-Docs @ v0.26.3 -Examples @ v0.26.3

Installation one-liner

kubectl apply -f https://infra.tekton.dev/tekton-releases/chains/previous/v0.26.3/release.yaml

Attestation

The Rekor UUID for this release is 108e9186e8c5677a48f46d165fc47afed5b254fe710ca6cc3d34f49019f2e53df43d1417a0877719

Obtain the attestation:

REKOR_UUID=108e9186e8c5677a48f46d165fc47afed5b254fe710ca6cc3d34f49019f2e53df43d1417a0877719
rekor-cli get --uuid $REKOR_UUID --format json | jq -r .Attestation | jq .

Verify that all container images in the attestation are in the release file:

RELEASE_FILE=https://infra.tekton.dev/tekton-releases/chains/previous/v0.26.3/release.yaml
REKOR_UUID=108e9186e8c5677a48f46d165fc47afed5b254fe710ca6cc3d34f49019f2e53df43d1417a0877719
Obtains the list of images with sha from the attestation
REKOR_ATTESTATION_IMAGES=$(rekor-cli get --uuid "$REKOR_UUID" --format json | jq -r .Attestation | jq -r '.subject[]|.name + ":v0.26.3@sha256:" + .digest.sha256')
Download the release file
curl -L "$RELEASE_FILE" > release.yaml
For each image in the attestation, match it to the release file
for image in $REKOR_ATTESTATION_IMAGES; do
printf $image; grep -q $image release.yaml && echo " ===> ok" || echo " ===> no match";
done

Changes

... (truncated)

Commits

• 868c359 fix: CVE-2026-34986, CVE-2026-33211, & CVE-2026-33186 (#1630)
• 7d7d316 fix ci workflow to include CI summary (#1633)
• See full diff in compare view

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[divyansh42]

/lgtm

[tekton-robot]

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