dotnet: use fallback target packages from current binary sdk

This was using the bootstrap SDK, which doesn't match the version of the
source-built SDK.  This will still be a problem if the binary and
source-built SDKs don't have the same version.

pkgs/development/compilers/dotnet/8/default.nix

@@ -5,4 +5,5 @@
   releaseInfoFile = ./release-info.json;
   bootstrapSdkFile = ./bootstrap-sdk.nix;
   depsFile = ./deps.nix;
+  fallbackTargetPackages = dotnetCorePackages.sdk_8_0.targetPackages;
 }

pkgs/development/compilers/dotnet/9/default.nix

@@ -6,4 +6,5 @@
   bootstrapSdkFile = ./bootstrap-sdk.nix;
   allowPrerelease = true;
   depsFile = ./deps.nix;
+  fallbackTargetPackages = dotnetCorePackages.sdk_9_0.targetPackages;
 }

pkgs/development/compilers/dotnet/dotnet.nix

@@ -8,6 +8,7 @@
   bootstrapSdkFile,
   allowPrerelease ? false,
   depsFile,
+  fallbackTargetPackages,
   pkgsBuildHost,
   buildDotnetSdk,
 }:
@@ -25,6 +26,7 @@ let
       releaseManifestFile
       tarballHash
       depsFile
+      fallbackTargetPackages
       ;
     bootstrapSdk = (buildDotnetSdk bootstrapSdkFile).sdk.unwrapped.overrideAttrs (old: {
       passthru = old.passthru or { } // {

pkgs/development/compilers/dotnet/stage0.nix

@@ -17,6 +17,7 @@
   releaseManifestFile,
   tarballHash,
   depsFile,
+  fallbackTargetPackages,
   bootstrapSdk,
 }:
 

pkgs/development/compilers/dotnet/stage1.nix

@@ -7,6 +7,7 @@
   tarballHash,
   depsFile,
   bootstrapSdk,
+  fallbackTargetPackages,
 }@args:
 
 let
@@ -33,8 +34,7 @@ let
 
 in
 mkPackages {
-  inherit vmr;
-  fallbackTargetPackages = bootstrapSdk.targetPackages;
+  inherit vmr fallbackTargetPackages;
 }
 // {
   stage0 = lib.dontRecurseIntoAttrs stage0;