Update registry1.dso.mil/ironbank/opensource/apache/tomcat11 Docker tag to v11.0.18

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/apache/tomcat11 (source)	ironbank-base	patch	11.0.15 → 11.0.18
registry1.dso.mil/ironbank/opensource/apache/tomcat11 (source)	final	patch	11.0.15 → 11.0.18

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