[AI Improvement] [Task] Upgrade puppeteer devDependency from ^19 to ^25 for storage conformance tests

[joehan]

Resolves Buganizer b/567662096

Proposed Improvement

Upgrades puppeteer devDependency from ^19.0.0 to ^25.0.0 and regenerates npm-shrinkwrap.json using CI-pinned npm@11.9. This resolves multiple high-severity dev audit vulnerabilities in puppeteer, @puppeteer/browsers, tar-fs, ws, and extract-zip.

Verification

• npm run build: Passed cleanly
• npm run lint:quiet: Passed cleanly (0 errors)
• npm run test:compile: Passed cleanly
• npm test -- src/emulator/storage/files.spec.ts src/emulator/storage/persistence.spec.ts: Passed cleanly
• npm audit --json: Confirmed puppeteer, @puppeteer/browsers, tar-fs, ws, and extract-zip vulnerabilities are eliminated

[gemini-code-assist]

Code Review

This pull request updates the puppeteer dependency in package.json from version ^19.0.0 to ^25.0.0. There are no review comments, and I have no feedback to provide.