docs: add Discord Social SDK 1.7.13152 changelog entry

Add changelog entry for Social SDK release 1.7.13152 which adds
macOS 10.15 support.

Author: markmandel

docs/change-log/2025-12-04-discord-social-sdk-1.7.13152.md

@@ -0,0 +1,12 @@
+---
+title: "Discord Social SDK Release 1.7.13152"
+date: "2025-12-04"
+topics:
+  - "Discord Social SDK"
+---
+
+A new release of the Discord Social SDK is now available, with the following updates:
+
+## macOS
+
+- Added support for macOS 10.15 to the build. The minimum versions are now 10.15 for Intel Macs and 11.0 for Apple Silicon Macs.