Master: Update tomcat Docker tag to v9.0.50

This MR contains the following updates:

Package	Type	Update	Change
tomcat	ironbank-docker	patch	9.0.48-jdk11-openjdk -> 9.0.50-jdk11-openjdk
tomcat		patch	9.0.48 -> 9.0.50
tomcat	stage	patch	9.0.48-jdk11-openjdk -> 9.0.50-jdk11-openjdk

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