release: cut the v20.3.0 release

Author: alan-agius4

CHANGELOG.md

@@ -1,6 +1,6 @@
-<a name="20.3.0-rc.0"></a>
+<a name="20.3.0"></a>
 
-# 20.3.0-rc.0 (2025-09-10)
+# 20.3.0 (2025-09-10)
 
 ## Breaking Changes
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@angular/devkit-repo",
-  "version": "20.3.0-rc.0",
+  "version": "20.3.0",
   "private": true,
   "description": "Software Development Kit for Angular",
   "keywords": [
@@ -174,6 +174,5 @@
   },
   "resolutions": {
     "typescript": "5.9.2"
-  },
-  "__ngDevExceptionalMinor__": true
+  }
 }