Fix tuple variant serialization with serde

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[github-actions]

Benchmark for 2bd4b57

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Test	Base	PR	%
apache_builds/simd_json::to_tape_with_buffers	93.2±2.11µs	94.5±2.48µs	+1.39%
canada/simd_json::to_tape_with_buffers	3.7±0.16ms	3.8±0.19ms	+2.70%
citm_catalog/simd_json::to_tape_with_buffers	1151.2±86.74µs	1151.8±84.77µs	+0.05%
event_stacktrace_10kb/simd_json::to_tape_with_buffers	3.8±0.17µs	3.9±0.25µs	+2.63%
github_events/simd_json::to_tape_with_buffers	41.5±1.07µs	41.5±1.17µs	0.00%
log/simd_json::to_tape_with_buffers	1579.0±96.16ns	1659.3±114.75ns	+5.09%
twitter/simd_json::to_tape_with_buffers	447.1±26.17µs	447.5±26.83µs	+0.09%

[github-actions]

Benchmark for 3e13db9

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Test	Base	PR	%
apache_builds/simd_json::to_tape_with_buffers	91.5±1.16µs	92.1±1.32µs	+0.66%
canada/simd_json::to_tape_with_buffers	4.0±0.18ms	3.8±0.16ms	-5.00%
citm_catalog/simd_json::to_tape_with_buffers	1139.2±84.59µs	1144.2±85.43µs	+0.44%
event_stacktrace_10kb/simd_json::to_tape_with_buffers	3.7±0.17µs	3.7±0.20µs	0.00%
github_events/simd_json::to_tape_with_buffers	40.4±0.74µs	40.3±0.78µs	-0.25%
log/simd_json::to_tape_with_buffers	1537.7±74.30ns	1614.9±75.69ns	+5.02%
twitter/simd_json::to_tape_with_buffers	444.6±25.76µs	444.6±25.53µs	0.00%