fix: failing github actions by updating test262

[alexandrenicol]

What?

Fixes the test:test262 step of the Github Action flow.

Should fix: #27

How?

• updating the test262 dependency
• updating the files whitelist in run_test262.js

Why?

• This was preventing the Github Actions to succeed
• Therefore preventing Yarn to publish the new tag release
• Therefore preventing Webpack to update to any version above 1.9.0 (webpack uses this repository, and we're using webpack in our organisation, and because we're stuck with 1.9.0, our systems are flagging some of the security issues that were present in 1.9.0).

Anything else?

outcome of running npm run test:test262

@alexandrenicol ➜ /workspaces/acorn-import-attributes (fix-test-262) $ npm run test:test262

> acorn-import-attributes@1.9.3 test:test262
> node run_test262.js

Testing complete.
Summary:
 ✔ 71 valid programs parsed without error
 ✔ 5 invalid programs produced a parsing error
 ✔ 10 invalid programs did not produce a parsing error (and allowed by the whitelist file)
 ✔ 111 valid programs produced a parsing error (and allowed by the whitelist file)
 ✔ 97695 programs were skipped

Which is similar to what it was when first introduced in #13 (comment)

[xtuc]

Nice, thanks!