chore(deps): update dependency zitadel to v7 (#81)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [Zitadel](https://redirect.github.com/smartive/zitadel-net) | `6.2.0`
-> `7.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/Zitadel/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/Zitadel/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/Zitadel/6.2.0/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Zitadel/6.2.0/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>smartive/zitadel-net (Zitadel)</summary>

###
[`v7.0.0`](https://redirect.github.com/smartive/zitadel-net/releases/tag/v7.0.0)

##### Features

- upgrade Zitadel Libs and remove old .net version
([#&#8203;933](https://redirect.github.com/smartive/zitadel-net/issues/933))
([09346e0](https://redirect.github.com/smartive/zitadel-net/commit/09346e02176a9ab0abef7e8069159d07955cd91e))

##### BREAKING CHANGES

-   change Zitadel default client mapping to
    V2 instead of V2Beta. Older APIs are still generated but the default
    helpers will create V2 clients.
-   remove .Net 6 and 7 since they are
    end of support.

</details>

---

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MumbleApi/MumbleApi.csproj

@@ -23,7 +23,7 @@
       <PackageReference Include="Swashbuckle.AspNetCore" Version="6.9.0" />
       <PackageReference Include="Swashbuckle.AspNetCore.Annotations" Version="6.9.0" />
       <PackageReference Include="Ulid" Version="1.3.4" />
-      <PackageReference Include="Zitadel" Version="6.2.0" />
+      <PackageReference Include="Zitadel" Version="7.0.0" />
     </ItemGroup>
 
     <ItemGroup>