Re-add pendulum to benchmarking for Python 3.12

[movermeyer]

What are you trying to accomplish?

Now that pendulum 3.0 has been released, pendulum works with Python 3.12.
Let's add it back to the benchmarks

What approach did you choose and why?

Removed the special casing around pendulum and Python 3.12

What should reviewers focus on?

🤷

The impact of these changes

We will have test data for pendulum and maya for Python 3.12

Testing

cd benchmarking
docker build -t ciso8601_benchmarking .
docker run -it --rm=true -v $(dirname `pwd`):/ciso8601 ciso8601_benchmarking