chore: Update crate versions

[anchpop]

I created this PR by following these instructions from @nathanosdev:

The following crates should use version 3.0.2:

1. ic-response-verification
2. ic-certification
3. ic-certificate-verification
4. ic-http-certification
5. ic-cbor

I recommend just setting them to 3 in Cargo.toml and ^3.0.2 in external_crates.bzl so they can be updated more easily in the future. That's how it's setup in ic-http-gateway too.
And ic-http-gateway can be set to version 0.1.0. The git tag reference can be removed now.

I also updated ic-agent to 0.39 because that is the version of ic-agent that ic-http-gateway v0.1.0 depends on. In doing so, I also updated ic-utils and ic-transport-types. I also moved the ic-http-gateway dependency to the workspace-level Cargo.toml.