chore(deps): upgrade Angular to v20

This commit was generated with:

    npx ng update @angular/core@20 @angular/cli@20 @angular/cdk@20 \
        @angular/localize@20 @angular/compiler-cli@20 \
        @angular/platform-browser@20 @angular-devkit/build-angular@20 \
        @sbb-esta/angular@20 angular-oauth2-oidc@20 \
        angular-server-side-configuration@20

See the migration guide:
https://angular.dev/update-guide?v=19.0-20.0&l=3

Signed-off-by: Simon Ser <contact@emersion.fr>

Author: emersion

angular.json

@@ -193,5 +193,31 @@
   },
   "cli": {
     "analytics": false
+  },
+  "schematics": {
+    "@schematics/angular:component": {
+      "type": "component"
+    },
+    "@schematics/angular:directive": {
+      "type": "directive"
+    },
+    "@schematics/angular:service": {
+      "type": "service"
+    },
+    "@schematics/angular:guard": {
+      "typeSeparator": "."
+    },
+    "@schematics/angular:interceptor": {
+      "typeSeparator": "."
+    },
+    "@schematics/angular:module": {
+      "typeSeparator": "."
+    },
+    "@schematics/angular:pipe": {
+      "typeSeparator": "."
+    },
+    "@schematics/angular:resolver": {
+      "typeSeparator": "."
+    }
   }
 }