Update angular monorepo to v21.2.6

Author: renovate[bot]

package.json

@@ -40,8 +40,8 @@
   },
   "homepage": "https://github.com/esm-bundle/angular__compiler#readme",
   "devDependencies": {
-    "@angular/compiler": "21.2.5",
-    "@angular/compiler-cli": "21.2.5",
+    "@angular/compiler": "21.2.6",
+    "@angular/compiler-cli": "21.2.6",
     "@rollup/plugin-babel": "7.0.0",
     "@rollup/plugin-terser": "1.0.0",
     "concurrently": "9.2.1",