bump find-cache-dir to v4

[JLHwung]

Please Read the CONTRIBUTING Guidelines
In particular the portion on Commit Message Formatting

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe: Bump find-cache-dir to v4

What is the current behavior? (You can also link to an open issue here)

The current find-cache-dir depends on make-dir which depends on [email protected].

What is the new behavior?

Behaviour is not changed.

Does this PR introduce a breaking change?

• Yes
• No

If this PR contains a breaking change, please describe the following...

• Impact:
• Migration path for existing applications:
• Github Issue(s) this is regarding:

Other information: Closes #994

[nicolo-ribaudo]

I remember old versions of webpack-cli having a bug when dynamic imports was used in loaders, but this should have been fixed by now.

[nicolo-ribaudo]

Can you move this at the top of the file, so that the import can start running in parallel with other webpack initialization logic?

const findCacheDirP = import("find-cache-dir");

...

// inside this function
      const { default: findCacheDir } = await findCacheDirP;