[CI] Slightly larger memory allocations

.github/workflows/test.yaml

@@ -21,7 +21,7 @@ jobs:
 
           for i in range(5):
               print(str(datetime.now()))
-              size = i * 1024 ** 2 * 256
+              size = i * 1024 ** 2 * 512
               print(f"I am about to allocate {size / 1024 ** 3} GiB of memory")
               a = bytearray(size)
               time.sleep(10)