merge master -Dorg -Ssuccess-only

Repository: ome/omero-server
Excluded PRs:
  - PR 175 sbesson 'Bump org.postgresql:postgresql to version 42.2.28' (stage: draft)
  - PR 168 scuniff 'ome#167  equals() comparing objects of different types' (user: scuniff)
  - PR 166 kkoz 'Experimenter group cache' (stage: draft)
  - PR 116 dominikl 'Add method to get pixel min max' (exclude comment)
Already up-to-date.

Merged PRs:
  - PR 151 jburel 'bump org.openmicroscopy.project 5.6.0'
  - PR 152 jburel 'Set class in doc'
  - PR 176 chris-allan 'Session bean actions should happen at `SYSTEM` priority'
  - PR 177 chris-allan 'Swap default min and background thread limits'

Conflicting PRs (not included):
  - PR 61 joshmoore 'Pass user executor to rendering tasks'

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