Update to syn 2.

This is merged upstream but not yet released to crates.io. It should be
in the next release, so no need for a patch file.

https://github.com/rusticata/asn1-rs/commit/df44b67c1359edb8f7c42d73a72493d0d6ee07c9
is the upstream change. https://github.com/rusticata/asn1-rs/issues/29
is the request for a new release.

Change-Id: Iec24971799cf89571838041ccea13b5365ab5e85
5 files changed