chore: sync Rust client with Apify OpenAPI spec v2-2026-08-27T071624Z

[Pijukatel]

Syncs the client's pinned OpenAPI specification version from v2-2026-08-14T072928Z to the latest published v2-2026-08-27T071624Z.

The spec delta over this range (an ActorNotice null enum member, a new ErrorType member, a RequestWithoutId bundling fix, StoreListActor.pictureUrl dropping format: uri, and two newly documented error responses) lands entirely on surfaces the client either does not model or handles generically (untyped error path), so no functional code change is required — only the version pin and metadata are updated.

Changes

• src/version.rs: bump API_SPEC_VERSION to v2-2026-08-27T071624Z.
• Cargo.toml: bump crate version to 0.9.1.
• CHANGELOG.md: add the 0.9.1 entry.

Verification

• cargo fmt --check, cargo clippy --all-targets --all-features -- -D warnings, and cargo build --all-targets all clean.
• Full integration test suite green against the live API.

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