Bump NBitcoin.Altcoins and NBitcoin in /src/Miningcore

Bumps [NBitcoin.Altcoins](https://github.com/MetacoSA/NBitcoin) and [NBitcoin](https://github.com/MetacoSA/NBitcoin). These dependencies needed to be updated together.

Updates `NBitcoin.Altcoins` from 3.0.21 to 3.0.28
- [Commits](MetacoSA/NBitcoin@NBitcoin.Altcoins/v3.0.21...NBitcoin.Altcoins/v3.0.28)

Updates `NBitcoin` from 7.0.36 to 7.0.42
- [Commits](MetacoSA/NBitcoin@v7.0.36...v7.0.42)

---
updated-dependencies:
- dependency-name: NBitcoin.Altcoins
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: NBitcoin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Miningcore/Miningcore.csproj

@@ -70,8 +70,8 @@
         <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
         <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
-        <PackageReference Include="NBitcoin" Version="7.0.36" />
-        <PackageReference Include="NBitcoin.Altcoins" Version="3.0.21" />
+        <PackageReference Include="NBitcoin" Version="7.0.42" />
+        <PackageReference Include="NBitcoin.Altcoins" Version="3.0.28" />
         <PackageReference Include="NBitcoin.Zcash" Version="3.0.0" />
         <PackageReference Include="NBitcoin.Secp256k1" Version="3.1.4" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />