OSD/ROSA GA and EOL dates for 4.15

Author: eohartman

modules/life-cycle-dates.adoc

@@ -15,9 +15,11 @@ endif::[]
 |===
 |Version    |General availability   |End of life
 ifdef::rosa-with-hcp[]
+|4.15       |Feb 27, 2024           |Jun 30, 2025
 |4.14       |Dec 4, 2023            |Feb 28, 2025
 endif::rosa-with-hcp[]
 ifndef::rosa-with-hcp[]
+|4.15       |Feb 27, 2024           |Jun 30, 2025
 |4.14       |Oct 31, 2023           |Feb 28, 2025
 |4.13       |May 17, 2023           |Sep 17, 2024
 |4.12       |Jan 17, 2023           |May 17, 2024