Made set_default_logger nullable (#7515)

Author: kraenhansen

CHANGELOG.md

@@ -17,6 +17,7 @@
 
 ### Internals
 * Update libuv used in object store tests from v1.35.0 to v1.48.0 ([PR #7508](https://github.com/realm/realm-core/pull/7508)).
+* Made `set_default_logger` nullable in the bindgen spec.yml (PR [#7515](https://github.com/realm/realm-core/pull/7515)).
 
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bindgen/spec.yml

@@ -745,7 +745,7 @@ classes:
     properties:
       get_default_logger: SharedLogger
     staticMethods:
-      set_default_logger: '(logger: SharedLogger)'
+      set_default_logger: '(logger: Nullable<SharedLogger>)'
 
   ConstTableRef:
     needsDeref: true