Update to .NET 6 Preview 5.

global.json

@@ -1,12 +1,12 @@
 {
   "tools": {
-    "dotnet": "6.0.100-preview.4.21253.7",
+    "dotnet": "6.0.100-preview.5.21302.13",
     "runtimes": {
       "dotnet": [
-        "6.0.0-preview.4.21253.7"
+        "6.0.0-preview.5.21301.5"
       ],
       "aspnetcore": [
-        "6.0.0-preview.4.21253.5"
+        "6.0.0-preview.5.21301.17"
       ]
     }
   },

src/Microsoft.Tye.Hosting/DockerRunner.cs

@@ -62,7 +62,7 @@ namespace Microsoft.Tye.Hosting
 
                 // Inject a proxy per non-container service. This allows the container to use normal host names within the
                 // container network to talk to services on the host
-                var proxyContainer = new DockerRunInfo($"mcr.microsoft.com/dotnet/core/sdk:3.1", "dotnet Microsoft.Tye.Proxy.dll")
+                var proxyContainer = new DockerRunInfo($"mcr.microsoft.com/dotnet/sdk:6.0", "dotnet Microsoft.Tye.Proxy.dll")
                 {
                     WorkingDirectory = "/app",
                     NetworkAlias = service.Description.Name,