Update dependency universal-silabs-flasher to v0.0.20 (#173)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[universal-silabs-flasher](https://github.com/NabuCasa/universal-silabs-flasher)
| `==0.0.19` -> `==0.0.20` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/universal-silabs-flasher/0.0.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/universal-silabs-flasher/0.0.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/universal-silabs-flasher/0.0.19/0.0.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

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### Release Notes

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

###
[`v0.0.20`](https://github.com/NabuCasa/universal-silabs-flasher/releases/tag/v0.0.20)

[Compare
Source](https://github.com/NabuCasa/universal-silabs-flasher/compare/v0.0.19...v0.0.20)

#### What's Changed

- Bump bellows to 0.39.0 by
[@&#8203;puddly](https://github.com/puddly) in
[https://github.com/NabuCasa/universal-silabs-flasher/pull/69](https://github.com/NabuCasa/universal-silabs-flasher/pull/69)

**Full Changelog**:
NabuCasa/universal-silabs-flasher@v0.0.19...v0.0.20

</details>

---

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images/universal-silabs-flasher/requirements.txt

@@ -1,2 +1,2 @@
-universal-silabs-flasher==0.0.19
+universal-silabs-flasher==0.0.20