chore(deps): Bump Fido2.AspNet from 3.0.1 to 4.0.0

---
updated-dependencies:
- dependency-name: Fido2.AspNet
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/src/ExoAuth.Api/ExoAuth.Api.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="AspNetCore.HealthChecks.NpgSql" Version="8.0.2" />
-    <PackageReference Include="Fido2.AspNet" Version="3.0.1" />
+    <PackageReference Include="Fido2.AspNet" Version="4.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.23" />
     <PackageReference Include="AspNetCore.HealthChecks.Redis" Version="8.0.1" />
     <PackageReference Include="Mediator.Abstractions" Version="3.0.1" />