Update registry1.dso.mil/ironbank/opensource/php/php Docker tag to v8.2.18

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/php/php	ironbank-base	patch	8.2.17 -> 8.2.18
registry1.dso.mil/ironbank/opensource/php/php	final	patch	8.2.17 -> 8.2.18

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