Plone.portlets

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Bug fixes:


- Fix DeprecationWarnings. [maurits] (4090)

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Internal:


- Update configuration files.
[plone devs] (237ff4c8)

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Breaking changes:


- Drop support for Plone 5.2 and Python 2.
Only Plone 6.0 on Python 3.8+ is supported.
[plone devs] (9)


Internal:


- Update configuration files.
[plone devs] (80cf330f)

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Bug fixes:


- Use `ZODB` as dependency rather than the deprecated `ZODB3`.
[gforcada] (1)
- Fix deprecation warnings (5)

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Bug fixes:


- Minor packaging updates. (1)

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Bug fixes:


- Fixed some deprecation warnings. Code style: black, isort Fix tests, also do
not leave closed files. [jensens] (4)