windows-v1.2.12

New and notable:

• ignore IPv6 config when searching for IPv4 gateway, reducing frequency of false "another VPN is active" errors #281

Other changes:

• fix ss:// URL interception #276
• use correct Sentry DSN in release builds (broken in https://github.com/Jigsaw-Code/outline-client/releases/tag/windows-v1.2.11) #283