Update dependency universal-silabs-flasher to v0.0.21 (#192)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[universal-silabs-flasher](https://togithub.com/NabuCasa/universal-silabs-flasher)
| `==0.0.20` -> `==0.0.21` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/universal-silabs-flasher/0.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/universal-silabs-flasher/0.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/universal-silabs-flasher/0.0.20/0.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/universal-silabs-flasher/0.0.20/0.0.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

<details>
<summary>NabuCasa/universal-silabs-flasher
(universal-silabs-flasher)</summary>

###
[`v0.0.21`](https://togithub.com/NabuCasa/universal-silabs-flasher/releases/tag/v0.0.21)

[Compare
Source](https://togithub.com/NabuCasa/universal-silabs-flasher/compare/v0.0.20...v0.0.21)

#### What's Changed

- Minimum version of click to 8.0.0 for get_parameter_source by
[@&#8203;sinipelto](https://togithub.com/sinipelto) in
[https://github.com/NabuCasa/universal-silabs-flasher/pull/72](https://togithub.com/NabuCasa/universal-silabs-flasher/pull/72)
- Drop hard dependency on `gpiod==1.5.4` by
[@&#8203;puddly](https://togithub.com/puddly) in
[https://github.com/NabuCasa/universal-silabs-flasher/pull/74](https://togithub.com/NabuCasa/universal-silabs-flasher/pull/74)

#### New Contributors

- [@&#8203;sinipelto](https://togithub.com/sinipelto) made their first
contribution in
[https://github.com/NabuCasa/universal-silabs-flasher/pull/72](https://togithub.com/NabuCasa/universal-silabs-flasher/pull/72)

**Full Changelog**:
NabuCasa/universal-silabs-flasher@v0.0.20...v0.0.21

</details>

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images/universal-silabs-flasher/requirements.txt

@@ -1,2 +1,2 @@
-universal-silabs-flasher==0.0.20
+universal-silabs-flasher==0.0.21