fix: update peerDependencies to Angular 20

Author: timdeschryver

docs/site/angular-auth-oidc-client/docs/migrations/v19-to-v20.md

@@ -0,0 +1,9 @@
+---
+sidebar_position: 94
+---
+
+# Version 19 to 20
+
+## TL;DR: Breaking Changes
+
+- Requires Angular v20 or higher

projects/angular-auth-oidc-client/package.json

@@ -3,9 +3,9 @@
   "author": "Damien Bowden & Fabian Gosebrink",
   "peerDependencies": {
     "rxjs": "^6.5.3 || ^7.4.0",
-    "@angular/core": ">=15.0.0",
-    "@angular/common": ">=15.0.0",
-    "@angular/router": ">=15.0.0"
+    "@angular/core": ">=20.0.0",
+    "@angular/common": ">=20.0.0",
+    "@angular/router": ">=20.0.0"
   },
   "dependencies": {
     "tslib": "^2.3.0",