Prepare 2.4 release (#324)

Release notes

This release starts publishing test results as a GitHub artifact so
tuf-conformance project can collect the results into a report:
https://theupdateframework.github.io/tuf-conformance/

Users are adviced to schedule a weekly run of tuf-conformance to ensure
that up-to-date results are available for the report.

* Publish the test results as GitHub artifact (#321)
* Add missing test for snapshot hashes (#306)
* Dependency updates

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

Author: jku

tuf_conformance/__init__.py

@@ -1,6 +1,6 @@
 import pytest
 
-__version__ = "2.3.0"
+__version__ = "2.4.0"
 
 # register pytest asserts before the imports happen in conftest.py
 pytest.register_assert_rewrite("tuf_conformance._internal.client_runner")