Update torch_xla wheels to have the suffix +cxx11 instead of .cxx11 #10549

Job	Run time
get-torch-commit	3s
get-torch-commit	3s
get-torch-commit	3s
Build PyTorch/XLA / build	18m 29s
Build PyTorch/XLA / build	18m 6s
Build PyTorch/XLA / build	32m 49s
CPU tests	0s
CPU tests	0s
Build docs	0s
Build docs	0s
TPU tests	0s
TPU tests	0s
TPU tests	0s
CPU tests / test (benchmark_tests)	6m 19s
Build docs / build-docs	2m 8s
CPU tests / test (python_tests, xla_op1)	6m 17s
CPU tests / test (python_tests, xla_op2)	6m 9s
CPU tests / test (python_tests, xla_op3)	6m 17s
CPU tests / test (python_tests, torch_mp_op)	6m 22s
CPU tests / test (cpp_tests, cpp_tests1)	4m 35s
CPU tests / test (cpp_tests, cpp_tests2)	5m 34s
	1h 53m 14s

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