chore(deps): update mcr.microsoft.com/dotnet/sdk docker tag to v9

renovate[bot] · SALTWOOD · commit d89b267087fe · 2025-01-18T00:10:35.000+09:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 # 使用微软提供的.NET SDK镜像作为构建阶段的基础镜像
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 
 # 设置工作目录
 WORKDIR /app
