security/softether-devel: Update to v4.30-9696-beta

The biggest topics of this version are JSON-RPC API and HTML5 based admin console.

Here's the summary of changes:

• Added the SoftEther VPN Server JSON-RPC API Suite implementation
• Added the Embedded HTML5-based Modern Admin Console
• Fixed the problem occurs when RPC messages between Cluster Members exceed 64Kbytes
• Fixed the RADIUS PEAP client to use the standard TLS versioning
• Added the support of ChaCha20-Poly1305-IETF AEAD for RUDP
• Added the function to display the protocol details about the VPN session
• Fixed the bug that the language switching function was disabled. (Build 9695 -> Build 9696)

Relnotes: https://www.softether.org/5-download/history
Sponsored by: HAW International, Inc.