fix(deps): update dependency ngx-toastr to v19 (#3321)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [ngx-toastr](https://ngx-toastr.vercel.app)
([source](https://togithub.com/scttcper/ngx-toastr)) | [`18.0.0` ->
`19.0.0`](https://renovatebot.com/diffs/npm/ngx-toastr/18.0.0/19.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/ngx-toastr/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/ngx-toastr/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/ngx-toastr/18.0.0/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/ngx-toastr/18.0.0/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>scttcper/ngx-toastr (ngx-toastr)</summary>

###
[`v19.0.0`](https://togithub.com/scttcper/ngx-toastr/releases/tag/v19.0.0)

[Compare
Source](https://togithub.com/scttcper/ngx-toastr/compare/v18.0.0...v19.0.0)

##### Features

- Angular 18 + enable usage with zoneless change detection
([#&#8203;1017](https://togithub.com/scttcper/ngx-toastr/issues/1017))
([5461eb4](https://togithub.com/scttcper/ngx-toastr/commit/5461eb4ea440229353826682a7a494e036db6bab))

##### BREAKING CHANGES

-   enable usage with zoneless change detection

Switched relevant parts to OnPush + Signals, so this will work with
zoneless change detection enabled. I deliberately didn't use any of the
new control flow syntax so this should technically still be compatible
with Angular 16 (at least in a small test app with 16 it still worked
for me)

</details>

---

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packages/demo/package.json

@@ -32,7 +32,7 @@
     "core-js": "3.37.1",
     "highlight.js": "11.9.0",
     "ngx-highlightjs": "10.0.0",
-    "ngx-toastr": "18.0.0",
+    "ngx-toastr": "19.0.0",
     "prettier": "2.8.8",
     "rxjs": "7.8.1",
     "tslib": "2.6.3",