chore(deps): update dependency docfx to 2.78.1 (#821)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [docfx](https://redirect.github.com/dotnet/docfx) | `2.78.0` ->
`2.78.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/docfx/2.78.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/docfx/2.78.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/docfx/2.78.0/2.78.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/docfx/2.78.0/2.78.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>dotnet/docfx (docfx)</summary>

###
[`v2.78.1`](https://redirect.github.com/dotnet/docfx/releases/tag/2.78.1)

<!-- Release notes generated using configuration in .github/release.yml
at main -->

#### What's Changed

##### 🐞 Bug Fixes

- fix: Place `.playwright` directory under bin directory by
[@&#8203;filzrev](https://redirect.github.com/filzrev) in
[https://github.com/dotnet/docfx/pull/10399](https://redirect.github.com/dotnet/docfx/pull/10399)
- fix: Use PlantUML Online Server as default configs by
[@&#8203;filzrev](https://redirect.github.com/filzrev) in
[https://github.com/dotnet/docfx/pull/10395](https://redirect.github.com/dotnet/docfx/pull/10395)

**Full Changelog**:
dotnet/docfx@v2.78.0...2.78.1

</details>

---

### Configuration

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

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

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.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "docfx": {
-      "version": "2.78.0",
+      "version": "2.78.1",
       "commands": ["docfx"]
     }
   }