Bump BouncyCastle.Cryptography in /src/KubernetesClient.Classic (#1557)

Bumps [BouncyCastle.Cryptography](https://github.com/bcgit/bc-csharp) from 2.2.1 to 2.3.1.
- [Commits](bcgit/bc-csharp@release-2.2.1...release-2.3.1)

---
updated-dependencies:
- dependency-name: BouncyCastle.Cryptography
  dependency-type: direct:production
...

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

src/KubernetesClient.Classic/KubernetesClient.Classic.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BouncyCastle.Cryptography" Version="2.2.1" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="7.1.2" />
     <PackageReference Include="IdentityModel.OidcClient" Version="5.2.1" />
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />