chore(deps): update registry1.dso.mil/ironbank/opensource/nodejs/nodejs20 docker tag to v20.15.0

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/nodejs/nodejs20		minor	20.14.0-slim -> 20.15.0-slim
registry1.dso.mil/ironbank/opensource/nodejs/nodejs20	ironbank-base	minor	20.14.0-slim -> 20.15.0-slim
registry1.dso.mil/ironbank/opensource/nodejs/nodejs20	final	minor	20.14.0-slim -> 20.15.0-slim
registry1.dso.mil/ironbank/opensource/nodejs/nodejs20	stage	minor	20.14.0-slim -> 20.15.0-slim

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