Bump smoltcp from 0.7.1 to 0.7.3#9

dependabot[bot] wants to merge 1 commit intomasterrust-iot/rust-lpwan:masterfrom

dependabot/cargo/smoltcp-0.7.3rust-iot/rust-lpwan:dependabot/cargo/smoltcp-0.7.3Copy head branch name to clipboard