chore(deps): update angular-eslint monorepo to v21

Author: renovate[bot]

package-lock.json

@@ -58,9 +58,9 @@
     "@angular-devkit/build-angular": "18.2.20",
     "@angular-devkit/core": "18.2.20",
     "@angular-devkit/schematics": "18.2.20",
-    "@angular-eslint/eslint-plugin": "19.8.1",
-    "@angular-eslint/eslint-plugin-template": "19.8.1",
-    "@angular-eslint/template-parser": "19.8.1",
+    "@angular-eslint/eslint-plugin": "21.2.0",
+    "@angular-eslint/eslint-plugin-template": "21.2.0",
+    "@angular-eslint/template-parser": "21.2.0",
     "@angular/cli": "^18.1.4",
     "@angular/compiler-cli": "18.2.0",
     "@angular/language-service": "18.2.0",