Update akka-actor, akka-slf4j, akka-stream to 2.6.19#553

scala-steward wants to merge 4 commits intophenoscape:masterphenoscape/phenoscape-kb-services:masterfrom

scala-steward:update/akka-actor-2.6.19scala-steward/phenoscape-kb-services:update/akka-actor-2.6.19Copy head branch name to clipboard