Bump test262 from 8c64a66 to 747bed2

Bumps [test262](https://github.com/tc39/test262) from `8c64a66` to `747bed2`.
- [Release notes](https://github.com/tc39/test262/releases)
- [Commits](tc39/test262@8c64a66...747bed2)

---
updated-dependencies:
- dependency-name: test262
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>