Bump Portable.BouncyCastle from 1.8.10 to 1.9.0 (#1556)

Bumps [Portable.BouncyCastle](https://github.com/novotnyllc/bc-csharp) from 1.8.10 to 1.9.0.
- [Release notes](https://github.com/novotnyllc/bc-csharp/releases)
- [Commits](novotnyllc/bc-csharp@pcl-v1.8.10...pcl-v1.9.0)

---
updated-dependencies:
- dependency-name: Portable.BouncyCastle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Libraries/Opc.Ua.Gds.Server.Common/Opc.Ua.Gds.Server.Common.csproj

@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
+    <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
     <ProjectReference Include="..\..\Stack\Opc.Ua.Core\Opc.Ua.Core.csproj" />
     <ProjectReference Include="..\Opc.Ua.Server\Opc.Ua.Server.csproj" />
   </ItemGroup>

Libraries/Opc.Ua.Security.Certificates/Opc.Ua.Security.Certificates.csproj

@@ -35,15 +35,15 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
+    <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net472'">
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
+    <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
+    <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
   </ItemGroup>
 
   <Target Name="GetPackagingOutputs" />