update dependencies for newer Macs

[jvantuyl]

Just tried to run this on an out-of-the-box M1 MacBook. It failed spectacularly due to some old versions of stuff not liking the new platform (I guess?).

I updated:

• golang.org/x/sys because it was failing to compile with an error[^1]
• github.com/ugorji/go because it would segfault handling the registration

[^1]: //go:linkname must refer to declared function or variable