Quarterly reminder to review and update the python deps we're using for markdown techdocs.

• [ ] Review the python/requirements* files and determine if we can update them and/or remove anything no longer required
• [ ] Ensure that the upstream and downstream builds pin the same versions, wherever possible

Note that where python deps do not distribute sources, a hermeto config workaround (or a security policy exception) is needed:

• https://github.com/hermetoproject/hermeto/blob/main/docs/pip.md#dependency-does-not-distribute-sources
• https://gitlab.cee.redhat.com/releng/konflux-release-data/-/blob/main/config/stone-prod-p02.hjvn.p1/product/EnterpriseContractPolicy/registry-rhdh-prod.yaml#L39-42

See also:

• https://github.com/hermetoproject/hermeto/blob/main/docs/pip.md#troubleshooting

Note also that these are the same (but we need the source zip, because 3.9.7 doesn't include sources in a way that makes hermeto happy):

plantuml-markdown @ https://github.com/mikitex70/plantuml-markdown/archive/fcf62aa930708368ec1daaad8b5b5dbe1d1b2014.zip#cachito_hash=sha256:a487c2312a53fe47a0947e8624290b2c8ea51e373140d02950531966b1db5caa

and

plantuml-markdown==3.9.7