chore(rust): Bump rust-toolchain from nightly-2026-07-21 to nightly-2026-07-28 in /ci/rust-nightly#4618

lidavidm merged 1 commit into

mainapache/arrow-adbc:mainfrom

dependabot/rust_toolchain/ci/rust-nightly/rust-toolchain-nightly-2026-07-28apache/arrow-adbc:dependabot/rust_toolchain/ci/rust-nightly/rust-toolchain-nightly-2026-07-28Copy head branch name to clipboard