Rename support fields to align with eol fields (#338)

Companion PR of https://github.com/endoflife-date/endoflife.date/pull/4931.

releases/zabbix.json

@@ -3,19 +3,19 @@
     "6.4": {
       "name": "6.4",
       "releaseDate": "2023-03-07",
-      "support": "2024-06-30",
+      "eoas": "2024-06-30",
       "eol": "2024-12-31"
     },
     "6.0": {
       "name": "6.0",
       "releaseDate": "2022-02-08",
-      "support": "2025-02-28",
+      "eoas": "2025-02-28",
       "eol": "2027-02-28"
     },
     "5.0": {
       "name": "5.0",
       "releaseDate": "2020-05-12",
-      "support": "2023-05-31",
+      "eoas": "2023-05-31",
       "eol": "2025-05-31"
     }
   },