Upgrade to v0.13.0 of go.opentelemetry.io/otel

[codeboten]

The new version moved/renamed several packages. Therefore we cannot upgrade to otel v0.13.0 without go-contrib also upgrading

[Aneurysm9]

Upgrading contrib is a standard part of our release process and typically follows a day behind. I've started on this process, but the propagator changes this time around are less amenable to s///g so it may take slightly longer.

[codeboten]

Hey @Aneurysm9, I wasn't sure if it was part of the process or not so thanks for clarifying!

[Aneurysm9]

No worries! I'd love to have a process whereby we could release the main repo and contrib simultaneously, but I'm not sure I see a great way to it since we need to be able to update the go.mod files in contrib to point to the new release tag. Once we hit 1.0 this will (hopefully) become a non-issue as we'll stop breaking things with every release! :)