fix(ci): refresh integrity hash for republished vitest-pool-workers snapshot

The pkg.pr.new tarball for @cloudflare/vitest-pool-workers@11632 was
republished with different content, so pnpm install --frozen-lockfile
failed with ERR_PNPM_TARBALL_INTEGRITY on every CI job (also red on
PR #46). Update the lockfile to the checksum the registry now serves.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBPrsDvrFACta2rq8qGLVF

Author: claude