build: Constrain social-auth-core to unblock other upgrades.

Author: feanil

requirements/constraints.txt

@@ -136,3 +136,7 @@ django-debug-toolbar<6.0.0
 # Issue: https://github.com/openedx/edx-platform/issues/37435
 cryptography<46.0.0
 pact-python<3.0.0
+
+# Date 2025-10-21
+# Issue: https://github.com/openedx/edx-platform/issues/37515
+social-auth-core==4.7.0