[Symfony] Add 7.3 (#7619)

Author: hebbet

products/symfony.md

@@ -26,6 +26,13 @@ auto:
 # - eoas(x) = releaseDate(x) + 8 months
 # - eol(x) = releaseDate(x) + 8 months
 releases:
+-   releaseCycle: "7.3"
+    releaseDate: 2025-05-29
+    eoas: 2026-01-31
+    eol: 2026-01-31
+    latest: "7.3.0"
+    latestReleaseDate: 2025-05-29
+
 -   releaseCycle: "7.2"
     releaseDate: 2024-11-29
     eoas: 2025-07-31