Bump Microsoft.SourceLink.GitHub and Microsoft.NETFramework.ReferenceAssemblies

Bumps [Microsoft.SourceLink.GitHub](https://github.com/dotnet/sourcelink) and [Microsoft.NETFramework.ReferenceAssemblies](https://github.com/Microsoft/dotnet). These dependencies needed to be updated together.

Updates `Microsoft.SourceLink.GitHub` from 1.1.1 to 8.0.0
- [Release notes](https://github.com/dotnet/sourcelink/releases)
- [Commits](dotnet/sourcelink@1.1.1...8.0.0)

Updates `Microsoft.NETFramework.ReferenceAssemblies` from 1.0.3 to 1.0.3
- [Commits](https://github.com/Microsoft/dotnet/commits)

---
updated-dependencies:
- dependency-name: Microsoft.SourceLink.GitHub
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.NETFramework.ReferenceAssemblies
  dependency-version: 1.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

BitPay/BitPay.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <!-- version numbers will be updated by build -->
@@ -53,7 +53,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
     <PackageReference Include="DotNet.ReproducibleBuilds" Version="1.1.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>