update: move to .NET 9 also in arm Dockerfile (#48)

Author: Ronto4

TransitApi/Dockerfile.arm

@@ -1,9 +1,9 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 COPY ["TransitApi/TransitApi.csproj", "TransitApi/"]
 RUN dotnet restore "TransitApi/TransitApi.csproj"

TransitWebViewer/Dockerfile.arm

@@ -1,9 +1,9 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 COPY ["TransitWebViewer/TransitWebViewer.csproj", "TransitWebViewer/"]
 RUN dotnet restore "TransitWebViewer/TransitWebViewer.csproj"