chore(deps): update dependency google.cloud.aiplatform.v1beta1 to 1.0.0-beta50 (#3201)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[Google.Cloud.AIPlatform.V1Beta1](https://redirect.github.com/googleapis/google-cloud-dotnet)
| `1.0.0-beta49` -> `1.0.0-beta50` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/Google.Cloud.AIPlatform.V1Beta1/1.0.0-beta50?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Google.Cloud.AIPlatform.V1Beta1/1.0.0-beta49/1.0.0-beta50?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>googleapis/google-cloud-dotnet
(Google.Cloud.AIPlatform.V1Beta1)</summary>

###
[`v1.0.0-beta50`](https://redirect.github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Cloud.AIPlatform.V1Beta1-1.0.0-beta50):
Google.Cloud.AIPlatform.V1Beta1 version 1.0.0-beta50

[Compare
Source](https://redirect.github.com/googleapis/google-cloud-dotnet/compare/Google.Cloud.AIPlatform.V1Beta1-1.0.0-beta49...Google.Cloud.AIPlatform.V1Beta1-1.0.0-beta50)

##### New features

- PSC support for custom weights deploy
- Tuning PreTunedModel API field

##### Documentation improvements

- A comment for field `dedicated_endpoint_disabled` in message
`.google.cloud.aiplatform.v1beta1.DeployRequest` is changed

</details>

---

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---

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---

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Author: renovate-bot

aiplatform/api/AIPlatform.Samples/AIPlatform.Samples.csproj

@@ -5,6 +5,6 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Cloud.AIPlatform.V1" Version="3.45.0" />
-    <PackageReference Include="Google.Cloud.AIPlatform.V1Beta1" Version="1.0.0-beta49" />
+    <PackageReference Include="Google.Cloud.AIPlatform.V1Beta1" Version="1.0.0-beta50" />
   </ItemGroup>
 </Project>