fix: refresh cookie options for rolling sessions

[raashish1601]

Changes

• Ensure cookie options are re-applied for each request when rolling: true, so updated config is reflected for existing sessions.
• Extracted cookie creation into a shared helper for consistency between new and existing sessions.
• Added regression test for an existing session receiving updated cookie attributes/expiry on rolling requests.

Validation

• node node_modules/mocha/bin/mocha --require test/support/env --check-leaks --no-exit --reporter spec --grep "rolling option" test/session.js
• node node_modules/mocha/bin/mocha --require test/support/env --check-leaks --no-exit --reporter spec test/session.js
• node node_modules/eslint/bin/eslint.js index.js test/session.js