Fix DeprecationWarnings.

[mauritsvanrees]

No description provided.

[mister-roboto]

@mauritsvanrees thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[mauritsvanrees]

This tries to fix the github actions as well, which have been broken on Python 3.9+ for a while. See for example this run with 3.9.

Version and requirements information containing docutils:
While:
  Installing releaser.
  [versions] constraint on docutils: 0.18.1
  Base installation request: 'zest.releaser[recommended]', 'zestreleaser.towncrier', 'towncrier', 'readme', 'docutils'
  Requirement of readme-renderer: docutils>=0.21.2
  Requirement of pyroma; extra == "recommended": docutils
  Requirement of readme_renderer[md]>=40: docutils>=0.21.2
Error: The requirement ('docutils>=0.21.2') is not allowed by your [versions] constraint (0.18.1)

And on 3.12 Pillow cannot be built.

Chosen solution now:

• Update from 6.0.9 to 6.0.14.
• Stop testing Python 3.8 on Plone 6, as it is not supported on 6.0.14, and it is hard to test only 3.8 and 6.0.13.
• Do still test 5.2 on 3.8, though this is by far the slowest combination.
• Start testing 6.0 on 3.13
• And start testing Plone 6.1.

[davisagli]

@mauritsvanrees @gforcada I made some more ambitious updates:

1. Drop support for Plone 5.2
2. Bump the version to 5.x (I created a 4.x branch from current main)
3. Remove bbb module and a patch that is no longer used.

@jenkins-plone-org please run jobs

[mauritsvanrees]

We'll party like there is no Plone 5.2. ;-)
Thanks.