fix: backend/api/api.csproj to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DOTNET-MICROSOFTIDENTITYABSTRACTIONS-9680155

Author: snyk-bot

backend/api/api.csproj

@@ -28,7 +28,7 @@
     <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.4" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.11" />
-    <PackageReference Include="Microsoft.Identity.Web" Version="3.3.0" />
+    <PackageReference Include="Microsoft.Identity.Web" Version="3.8.2" />
     <PackageReference Include="Microsoft.Identity.Web.DownstreamApi" Version="3.3.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
     <PackageReference Include="MQTTnet" Version="4.3.6.1152" />