Update dependency autoprefixer to v10.4.19 (#45)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [autoprefixer](https://togithub.com/postcss/autoprefixer) | [`10.4.18`
->
`10.4.19`](https://renovatebot.com/diffs/npm/autoprefixer/10.4.18/10.4.19)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/autoprefixer/10.4.19?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/autoprefixer/10.4.19?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/autoprefixer/10.4.18/10.4.19?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/autoprefixer/10.4.18/10.4.19?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>postcss/autoprefixer (autoprefixer)</summary>

###
[`v10.4.19`](https://togithub.com/postcss/autoprefixer/blob/HEAD/CHANGELOG.md#10419)

[Compare
Source](https://togithub.com/postcss/autoprefixer/compare/10.4.18...10.4.19)

- Removed `end value has mixed support, consider using flex-end` warning
    since `end`/`start` now have good support.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 10am on Thursday" (UTC),
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.

---

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