update acorn-import-assertions to acorn-import-attributes

[alexandrenicol]

What kind of change does this PR introduce?

Did you add tests for your changes?

Does this PR introduce a breaking change?

What needs to be documented once your changes are merged?

[linux-foundation-easycla]

• ✅login: alexandrenicol / (8f2bb13)

The committers listed above are authorized under a signed CLA.

[webpack-bot]

For maintainers only:

• This needs to be documented (issue in webpack/webpack.js.org will be filed when merged)
• This needs to be backported to webpack 4 (issue will be created when merged)

[alexander-akait]

Thank for your PR, we already work on it #18251, we need more changes, I will finish it today, anyway thank you again

[alexandrenicol]

@alexander-akait thank you, sorry I missed your PR!