fix(utoipa-gen): disambiguate ToSchema::name conversion for Cow<str>

[cfilipescu]

Summary

• Replace String::from(<...>::name().as_ref()) with String::from(&*<...>::name()) in utoipa-gen.
• This avoids ambiguous trait inference when downstream dependency graphs introduce additional AsRef impls for Cow<'_, str>.
• Behavior stays the same; this only makes the conversion target explicit.

Validation

• cargo fmt --check --package utoipa-gen
• cargo clippy --quiet --package utoipa-gen
• ./scripts/test.sh utoipa-gen

Downstream Repro Check

• Verified in a downstream workspace where upgrading zip to 7.4.x triggered the ambiguity.
• With this patch applied, cargo clippy --all-targets -- -Dwarnings passes.

[ctron]

Just ran into the same issue. Came up with the same fix. It would be helpful to have this merged and released.