Bump dotnet/aspnet from 8.0-alpine to 9.0-alpine

Bumps dotnet/aspnet from 8.0-alpine to 9.0-alpine.

---
updated-dependencies:
- dependency-name: dotnet/aspnet
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Dockerfile

@@ -9,7 +9,7 @@ RUN dotnet restore ./Api/Api.csproj
 
 RUN dotnet publish ./Api/Api.csproj -c Release -o /app/publish
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-alpine
 
 COPY --from=build /app/publish .