Upgrade dependencies and deprecated Go module

[mfridman]

This PR does a few things, but the ultimate goal is to deprecate the older Go module:

go: module github.com/golang/protobuf is deprecated: Use the "google.golang.org/protobuf" module instead.

1. Replace types for their equivalent google.golang.org/protobuf counterparts
2. Update go.mod deps and tidy
3. Re-generate the examples in ./protos directory with the latest protoc version (26.1) and the latest protoc-gen-go version (v1.33.0).
4. Update Makefile
5. Bumps go version to 1.16 (from 1.15), to use io.ReadAll (ioutil was deprecated).
6. Bumps GitHub actions to the latest major workflows

cc @mescanne wdyt about also tagging a semver release like v1.1.0?

[mescanne]

Looks good to me. New semver release also makes sense.

[mfridman]

Awesome, thanks for taking a look. I'm happy to help address outstanding issues or make incremental improvements if you're up for a few reviews.

Also, thank you for publishing a new release 🙌 .

[mescanne]

I'm currently really maxed out... I'll see what I can. My main concern is not breaking existing functionality. But it's better to keep code in a single place rather than having multiple forks if possible.

[mescanne]

Oh, drat, and I forgot to merge your changes before the release!

[mfridman]

No worries, appreciate you still maintaining the project and willing to make forward progress.