Bump proc-macro2 from 1.0.24 to 1.0.50 in /src/rust#142

dependabot[bot] wants to merge 1 commit intomainreaperhulk/cryptography:mainfrom

dependabot/cargo/src/rust/proc-macro2-1.0.50reaperhulk/cryptography:dependabot/cargo/src/rust/proc-macro2-1.0.50Copy head branch name to clipboard