feat: Remove unused deps, drop minor version pins and update

[astuyve]

1. We merged dogstatsd upstream to libdatadog, but we left all the dependencies in main. This removes those dependencies
2. By default cargo will use the patch version of whatever we install, and now we're a few fixes behind. I'm switching everything to grab the latest patch release for every minor version and will give a second pass for things we can open up to any major.
3. Updates licenses