ci(lock): lock taiki-e/install-action@v2.87.26 (fixes lint red on main since #412)

[hyperpolymath]

Fixes the lockfile step that has been red on main since #412.

PR #412 (dependabot, actions group) moved mvp-smoke.yml and s4-loop.yml from taiki-e/install-action@v2.87.22 to v2.87.26, but did not update actions.lock. The Verify immutable action lockfile step then fails, which makes lint-workflows / Workflow Security Linter red on main.

The change is one lock entry: v2.87.26 at the upstream tag commit f7e5d7c, with the same owner_id and repo_id. No workflow references v2.87.22 any more, so that entry is replaced.

Verified:

• No workflow file references an unlocked action ref (checked by parsing every uses:).
• The authoritative gh-actions-lock --rescan --no-fix could not be run from the agent sandbox (its release download is outside the allow-list). CI is the verifier here.

Note: this PR was prepared after #417 had already merged, so it is based on current main.

[coderabbitai]

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⛔ Files ignored due to path filters (1)

• .github/workflows/actions.lock is excluded by !**/*.lock

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