Bump Microsoft.AspNetCore.Authentication.JwtBearer in /Backend

Bumps [Microsoft.AspNetCore.Authentication.JwtBearer](https://github.com/dotnet/aspnetcore) from 6.0.26 to 6.0.27.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.26...v6.0.27)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Authentication.JwtBearer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Backend/BackendFramework.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="RelaxNG" Version="3.2.3" >
       <NoWarn>NU1701</NoWarn>
     </PackageReference>
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="6.0.26" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="6.0.27" />
     <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="6.35.0" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.35.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />