Updates Cargo to remove build warning about mismatch resolvers

[jlb6740]

Removes this warning:

warning: virtual workspace defaulting to resolver = "1" despite one or more workspace members being on edition 2021 which implies resolver = "2"
note: to keep the current resolver, specify workspace.resolver = "1" in the workspace root's manifest
note: to use the edition 2021 resolver, specify workspace.resolver = "2" in the workspace root's manifest
note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions

[fitzgen]

Thanks!