chore: fix doc.rs build failure

[stormslowly]

fix docs.rs doc build failure
https://docs.rs/crate/rspack_resolver/latest/builds/2653418/x86_64-unknown-linux-gnu.txt

[Copilot]

Pull Request Overview

This PR fixes a doc.rs build failure by correcting the unstable feature flag used for documentation generation. The issue was caused by using the deprecated doc_auto_cfg feature instead of the correct doc_cfg feature.

Key Changes:

• Replaced doc_auto_cfg with doc_cfg feature flag in lib.rs
• Updated nightly toolchain from 2025-07-28 to 2025-11-10
• Bumped version from 0.6.5 to 0.6.6

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
src/lib.rs	Fixed feature flag from doc_auto_cfg to doc_cfg to resolve doc.rs build issues
rust-toolchain.toml	Updated nightly toolchain version to support the corrected feature flag
Cargo.toml	Bumped patch version to 0.6.6 for the build fix release
Cargo.lock	Updated version reference to match Cargo.toml changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #130 will not alter performance

_{Comparing fix/crate_docs.rs (d0053e7) with main (a8e2142)¹}

Summary

✅ 6 untouched

Footnotes

1. No successful run was found on main (99ffdd7) during the generation of this report, so a8e2142 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩