experimental-io-uring feature on actix-files causes panic

[veeshi]

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Expected Behavior

The experimental-io-uring feature on actix-files should work on kernels with io-uring support.

Current Behavior

Enabling the feature causes a panic when serving a named file:

'cannot access a scoped thread local variable without calling `set` first', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.1/src/lib.rs:168:9

Possible Solution

Steps to Reproduce (for bugs)

1. Enable the experimental-io-uring feature on actix-files
2. Serve a NamedFile.
3. Visit the endpoint.

Context

Working to reduce latency when serving static files.

Your Environment

• Rust Version: 1.68.2
• Actix Web Version: 4.3.1
• Actix Files Version: 0.6.2