v1.5.4

• Update Grafana to 1.9.1 (@osigida) #32
• Interpolate "version" and "type" attributes to build grafana file url (Bernhard Köhler) #31 and (Olivier Bazoud)
  #29
• Add support for lambdas in datasources. This change makes it possible to
  evaluate derived attributes correctly. (Bernhard Köhler) #30
  and #25