Bump JetBrains.Annotations from 2025.2.4 to 2026.2.0 (#190)

---
updated-dependencies:
- dependency-name: JetBrains.Annotations
  dependency-version: 2026.2.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Build.props

@@ -48,7 +48,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="JetBrains.Annotations" Version="2025.2.*" PrivateAssets="All" />
+    <PackageReference Include="JetBrains.Annotations" Version="2026.2.*" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>