Change log 3.4.0

[bbpbuildbot]

Logfiles from GitLab pipeline #218246 (:white_check_mark:) have been uploaded here!

Status and direct links:

• :white_check_mark: docs
• :white_check_mark: test-unit
• :white_check_mark: test-integration
• :white_check_mark: test-integration-e2e
• :white_check_mark: test-scientific
• :white_check_mark: test-scientific-ngv
• :white_check_mark: set_alt_branches
• :white_check_mark: build-package
• :gear: publish-package
• :gear: publish-docs