Bump angular-eslint in /generators/ionic/resources/base

Bumps [angular-eslint](https://github.com/angular-eslint/angular-eslint/tree/HEAD/packages/angular-eslint) from 19.6.0 to 20.5.0.
- [Release notes](https://github.com/angular-eslint/angular-eslint/releases)
- [Changelog](https://github.com/angular-eslint/angular-eslint/blob/main/packages/angular-eslint/CHANGELOG.md)
- [Commits](https://github.com/angular-eslint/angular-eslint/commits/v20.5.0/packages/angular-eslint)

---
updated-dependencies:
- dependency-name: angular-eslint
  dependency-version: 20.5.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

generators/ionic/resources/base/package.json

@@ -64,7 +64,7 @@
     "@ionic/cli": "^7.2.0",
     "@types/jest": "29.5.14",
     "@types/node": "^24.0.1",
-    "angular-eslint": "19.6.0",
+    "angular-eslint": "20.5.0",
     "cypress": "15.4.0",
     "eslint": "^9.12.0",
     "eslint-plugin-cypress": "5.2.0",