Bump Avalonia and Avalonia.Themes.Fluent

Bumps Avalonia from 11.3.11 to 11.3.12
Bumps Avalonia.Themes.Fluent from 11.3.11 to 11.3.12

---
updated-dependencies:
- dependency-name: Avalonia
  dependency-version: 11.3.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Avalonia.Themes.Fluent
  dependency-version: 11.3.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

BabySmash.Linux/BabySmash.Linux.csproj

@@ -26,9 +26,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.3.11" />
+    <PackageReference Include="Avalonia" Version="11.3.12" />
     <PackageReference Include="Avalonia.Desktop" Version="11.3.11" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.11" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.12" />
     <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.11" />
     <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
     <PackageReference Include="Avalonia.Diagnostics" Version="11.3.11">