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

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

releases/ibm-i.json

@@ -12,13 +12,13 @@
       "name": "7.3",
       "releaseDate": "2016-04-15",
       "eol": "2023-09-30",
-      "extendedSupport": "2026-09-30"
+      "eoes": "2026-09-30"
     },
     "7.2": {
       "name": "7.2",
       "releaseDate": "2014-05-02",
       "eol": "2021-04-30",
-      "extendedSupport": "2026-04-30"
+      "eoes": "2026-04-30"
     },
     "7.1": {
       "name": "7.1",
@@ -29,19 +29,19 @@
       "name": "6.1",
       "releaseDate": "2008-03-21",
       "eol": "2015-09-30",
-      "extendedSupport": "2019-09-30"
+      "eoes": "2019-09-30"
     },
     "5.4": {
       "name": "5.4",
       "releaseDate": "2006-02-14",
       "eol": "2013-09-30",
-      "extendedSupport": "2017-09-30"
+      "eoes": "2017-09-30"
     },
     "5.3": {
       "name": "5.3",
       "releaseDate": "2004-06-11",
       "eol": "2009-04-30",
-      "extendedSupport": "2013-04-30"
+      "eoes": "2013-04-30"
     },
     "5.2": {
       "name": "5.2",
@@ -57,13 +57,13 @@
       "name": "4.5",
       "releaseDate": "2000-07-28",
       "eol": "2002-07-31",
-      "extendedSupport": "2002-12-31"
+      "eoes": "2002-12-31"
     },
     "4.4": {
       "name": "4.4",
       "releaseDate": "1999-05-21",
       "eol": "2001-05-31",
-      "extendedSupport": "2001-11-30"
+      "eoes": "2001-11-30"
     },
     "4.3": {
       "name": "4.3",
@@ -74,7 +74,7 @@
       "name": "4.2",
       "releaseDate": "1998-02-27",
       "eol": "2000-05-31",
-      "extendedSupport": "2001-01-31"
+      "eoes": "2001-01-31"
     },
     "4.1": {
       "name": "4.1",