Hotfix/adding release v5.2.0 news

[mvesin]

PR description

Backmerge news for v5.2 to develop

Developer Certificate Of Origin (DCO)

By opening this merge request, you agree to the
Developer Certificate of Origin (DCO)

This DCO essentially means that:

• you offer the changes under the same license agreement as the project, and
• you have the right to do that,
• you did not steal somebody else’s work.

License

Project code files should begin with these comment lines to help trace their origin:

# This file is originally part of Fed-BioMed
# SPDX-License-Identifier: Apache-2.0

Code files can be reused from another project with a compatible non-contaminating license.
They shall retain the original license and copyright mentions.
The CREDIT.md file and credit/ directory shall be completed and updated accordingly.

Guidelines for PR review

General:

• give a glance to DoD
• check coding rules and coding style
• check docstrings (eg run tests/docstrings/check_docstrings)

Specific to some cases:

• update all conda envs consistently (development and vpn, Linux and MacOS)
• if modified researcher (eg new attributes in classes) check if breakpoint needs update (breakpoint/load_breakpoint in Experiment(), save_state_breakpoint/load_state_breakpoint in aggregators, strategies, secagg, etc.)
• if modified a component with versioning (config files, breakpoint, messaging protocol) then update the version following the rules in common/utils/_versions.py