chore: move to pnpm

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Benchmark for 8737016

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| Test | Base | PR | % | |------|--------------|------------------|---| | DepthMap::from_parent | 43.3±3.96µs | 42.5±0.81µs | -1.85% | | fix_complex_query | **11.3±0.09ms** | 11.4±0.12ms | **+0.88%** | | parse_complex_query | 2.8±0.04µs | 2.8±0.02µs | 0.00% | | parse_expression_recursion | 5.2±0.07µs | **5.0±0.03µs** | **-3.85%** | | parse_simple_query | 845.2±5.91ns | **807.8±6.53ns** | **-4.42%** |