Bump webdav from 3.6.2 to 4.0.0

[dependabot-preview]

Bumps webdav from 3.6.2 to 4.0.0.

Changelog

Sourced from webdav's changelog.

v4.0.0

2021-02-01

• Major release
  • Project re-written in Typescript

Breaking changes:

• Authentication is explicit in v4, when not using basic/no authentication. Specify the authentication type when creating the client.
• headers can be specified when creating a client. These are overridden by method-specific headers when making requests.

Commits

• 30850ad 4.0.0
• b262b2c Prepare v4.0.0
• 480dfff Audit dependencies
• 98f2af5 4.0.0-r01
• 6d47049 Merge pull request #234 from perry-mitchell/typescript
• 85e9fae Update other dependencies
• 5188ad4 Update deps, format files
• bb6cc02 Merge branch 'typescript' of github.com:perry-mitchell/webdav-client into typ...
• a6a7c16 Update fast-xml-parser
• 862543d Document client options
• Additional commits viewable in compare view

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[skjnldsv]

@dependabot ignore this major version

[dependabot-preview]

OK, I won't notify you about version 4.x.x again, unless you re-open this PR or update to a 4.x.x release yourself.

[skjnldsv]

See perry-mitchell/webdav-client#238 (comment)