examples/device: switch over to UMTensor #1410

Job	Run time
macos-latest: clang++ Release PaRSEC	5m 20s
macos-latest: clang++ Debug PaRSEC	8m 50s
macos-latest: clang++ Debug Pthreads	7m 37s
ubuntu-24.04: /usr/bin/g++-14 Release PaRSEC	6m 35s
macos-latest: clang++ Release Pthreads	20m 55s
ubuntu-24.04: /usr/bin/g++-14 Debug Pthreads	10m 12s
ubuntu-24.04: /usr/bin/g++-14 Release Pthreads	7m 2s
ubuntu-24.04: /usr/bin/g++-14 Debug PaRSEC	9m 24s
	1h 15m 55s

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