Bump arch in patch version

[MischaPanch]

For some reason, pip and other installers like poetry don't find arch==5.3.0 on pypi (they do find all other versions), wherefore I can't install rliable

pip install arch==5.3.0
ERROR: Could not find a version that satisfies the requirement arch==5.3.0 (from versions: 1.0, 2.0, 3.0, 3.1, 3.2, 4.0, 4.1, 4.2, 4.3, 4.3.1, 4.4.1, 4.5.0, 4.6.0, 4.7.0, 4.8.0, 4.8.1, 4.9.0, 4.9.1, 4.10.0, 4.11, 4.12, 4.13, 4.14, 4.15, 4.16, 4.16.1, 4.17, 4.18, 4.19, 5.0, 5.0.1, 5.1.0, 5.2.0, 5.3.1, 5.4.0, 5.5.0, 5.6.0, 6.0.0, 6.0.1, 6.1.0, 6.2.0, 6.3.0)
ERROR: No matching distribution found for arch==5.3.0

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.