gh-143055: register _PyAsyncGenUnpack_Type with the C globals analyzer

Add the new static type to Tools/c-analyzer/cpython/globals-to-fix.tsv
alongside the other genobject static types, so the check-c-globals CI step
passes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: graingert

Tools/c-analyzer/cpython/globals-to-fix.tsv

@@ -53,6 +53,7 @@ Objects/genobject.c	-	PyCoro_Type	-
 Objects/genobject.c	-	PyGen_Type	-
 Objects/genobject.c	-	_PyAsyncGenASend_Type	-
 Objects/genobject.c	-	_PyAsyncGenAThrow_Type	-
+Objects/genobject.c	-	_PyAsyncGenUnpack_Type	-
 Objects/genobject.c	-	_PyAsyncGenWrappedValue_Type	-
 Objects/genobject.c	-	_PyCoroWrapper_Type	-
 Objects/interpolationobject.c	-	_PyInterpolation_Type	-