[cleanup] Remove semicolon after function

Found by GCC 16 (-Wpedantic).

Author: gruenich

experimental/benchmark/edgeBetweennessCentrality_demo.c

@@ -29,7 +29,7 @@ double difference(GrB_Matrix bc, GrB_Matrix reference_bc)
     GrB_free(&diff) ;
 
     return err ;
-} ;
+}
 
 int main (int argc, char **argv)
 {

experimental/test/test_SquareClustering.c

@@ -100,7 +100,7 @@ void test_SquareClustering (void)
     OK (LAGraph_Delete (&G, msg)) ;
 
     LAGraph_Finalize (msg) ;
-};
+}
 
 TEST_LIST = {
     {"SquareClustering", test_SquareClustering},