Update registry1.dso.mil/ironbank/opensource/nodejs/nodejs18 Docker tag to v18.15.0

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/nodejs/nodejs18	ironbank-base	minor	18.14.2 -> 18.15.0
registry1.dso.mil/ironbank/opensource/nodejs/nodejs18	final	minor	18.14.2 -> 18.15.0

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