wgpu template: update wgpu 27 -> 29, generated #82

Job	Run time
lint (cargo-gpu)	6m 58s
lint (spirv-builder)	6m 17s
test (windows-2022, cargo-gpu)	14m 37s
test (macOS-latest, cargo-gpu)	9m 28s
xtask test & lint	7m 33s
test (windows-2022, spirv-builder)	12m 0s
test (macOS-latest, spirv-builder)	7m 45s
test (ubuntu-24.04, spirv-builder)	7m 35s
test (ubuntu-24.04, cargo-gpu)	8m 41s
test_success	4s
	1h 20m 58s

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