fix(deps): update dependency tocbot to v4.21.0 (#4463)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [tocbot](https://github.com/tscanlin/tocbot) | [`4.20.1` ->
`4.21.0`](https://renovatebot.com/diffs/npm/tocbot/4.20.1/4.21.0) |
[![age](https://badges.renovateapi.com/packages/npm/tocbot/4.21.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/tocbot/4.21.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/tocbot/4.21.0/compatibility-slim/4.20.1)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/tocbot/4.21.0/confidence-slim/4.20.1)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>tscanlin/tocbot</summary>

###
[`v4.21.0`](https://github.com/tscanlin/tocbot/compare/v4.20.1...v4.21.0)

[Compare
Source](https://github.com/tscanlin/tocbot/compare/v4.20.1...v4.21.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://app.renovatebot.com/dashboard#github/SAP/ui5-webcomponents-react).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNS4zNC4xIiwidXBkYXRlZEluVmVyIjoiMzUuMzQuMSJ9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

yarn.lock

@@ -20861,9 +20861,9 @@ __metadata:
   linkType: hard
 
 "tocbot@npm:^4.12.0":
-  version: 4.20.1
-  resolution: "tocbot@npm:4.20.1"
-  checksum: ca8fb4f89ba6e1846837cef433c25671507eeef9c869aebf7716d331c4b338b7aa396607f0a2d520d0d758f891bd12817144d03b0d517b09310d4478a2161dcc
+  version: 4.21.0
+  resolution: "tocbot@npm:4.21.0"
+  checksum: 473686301b14f3ad275f5e39a0cbd1e7a4cb5856a98653d916ec4fb09fb6e6cd913f000bc8299fdd42511001d0b53bfce2d041ed949de2a13e4f3daa88931f56
   languageName: node
   linkType: hard