Bump Microsoft.ML.OnnxRuntime from 1.18.1 to 1.26.0

---
updated-dependencies:
- dependency-name: Microsoft.ML.OnnxRuntime
  dependency-version: 1.26.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/ks0223-web-mac/backend/backend.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ML.OnnxRuntime" Version="1.18.1" />
+    <PackageReference Include="Microsoft.ML.OnnxRuntime" Version="1.26.0" />
     <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
   </ItemGroup>