DEV: Begin development of v2026.3.0-latest (#38083)

Merging this will trigger the creation of a `release/2026.2` branch on
the preceding commit.

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

lib/version.rb

@@ -5,7 +5,7 @@ module Discourse
   unless defined?(::Discourse::VERSION)
     module VERSION #:nodoc:
       # Use the `version_bump:*` rake tasks to update this value
-      STRING = "2026.2.0-latest"
+      STRING = "2026.3.0-latest"
 
       PARTS = STRING.split(".")
       private_constant :PARTS

versions.json

@@ -1,9 +1,17 @@
 {
+  "2026.3": {
+    "developmentStartDate": "2026-02-26",
+    "releaseDate": "2026-03",
+    "supportEndDate": "2026-05",
+    "released": false,
+    "esr": false,
+    "supported": true
+  },
   "2026.2": {
     "developmentStartDate": "2026-01-28",
-    "releaseDate": "2026-02",
+    "releaseDate": "2026-02-26",
     "supportEndDate": "2026-04",
-    "released": false,
+    "released": true,
     "esr": false,
     "supported": true
   },
@@ -18,10 +26,10 @@
   "2025.12": {
     "releaseDate": "2025-12-30",
     "developmentStartDate": "2025-11-25",
-    "supportEndDate": "2026-02",
+    "supportEndDate": "2026-02-26",
     "released": true,
     "esr": false,
-    "supported": true
+    "supported": false
   },
   "2025.11": {
     "releaseDate": "2025-11-25",