Bump the dotnet-docker group across 1 directory with 2 updates (#1468)

Bumps the dotnet-docker group with 2 updates in the /server/Tingle.Dependabot directory: dotnet/aspnet and dotnet/sdk.


Updates `dotnet/aspnet` from 8.0-bookworm-slim to 9.0-bookworm-slim

Updates `dotnet/sdk` from 8.0-bookworm-slim to 9.0-bookworm-slim

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

server/Tingle.Dependabot/Dockerfile

@@ -1,13 +1,13 @@
 #See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-bookworm-slim AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-bookworm-slim AS base
 LABEL org.opencontainers.image.source="https://github.com/tinglesoftware/dependabot-azure-devops"
 USER app
 WORKDIR /app
 EXPOSE 8080
 EXPOSE 8081
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-bookworm-slim AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
 COPY ["server/Directory.Build.props", "server/"]

server/Tingle.Dependabot/Dockerfile.CI

@@ -4,7 +4,7 @@
 #
 # As a result, we only copy publish output and put it in the container
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-bookworm-slim AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-bookworm-slim AS base
 LABEL org.opencontainers.image.source="https://github.com/tinglesoftware/dependabot-azure-devops"
 USER app
 WORKDIR /app