Update Rust crate actix-files to v0.6.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actix-files (source)	dependencies	patch	=0.6.5 -> =0.6.6

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Release Notes

actix/actix-web (actix-files)

### [`v0.6.6`](https://togithub.com/actix/actix-web/releases/tag/v0.6.6): Actix web 0.6.6 [Compare Source](https://togithub.com/actix/actix-web/compare/v0.6.5...v0.6.6) #### Changes - Panic during middleware execution [#​226](https://togithub.com/actix/actix-web/issues/226) - Add support for listen_tls/listen_ssl [#​224](https://togithub.com/actix/actix-web/issues/224) - `Ranges` header support for `NamedFile` [#​60](https://togithub.com/actix/actix-web/issues/60) - Implement extractor for `Session`

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