fix[gpu]: retain device buffers for dyn dispatch kernel (#7980) #30

Job	Run time
bench (random-access-bench, Random Access, --features lance, parquet,lance,vortex)	8s
commit-metadata	1m 41s
sql / bench (tpch-s3-10, tpch, TPC-H SF=10 on S3, vortex-bench/data/tpch/10.0, s3://vortex-ci-benchmark...	9s
sql / bench (tpch-nvme, tpch, TPC-H SF=1 on NVME, parquet, vortex, vortex-compact, duckdb, datafusion, ...	11s
sql / bench (tpcds-nvme, tpcds, TPC-DS SF=1 on NVME, parquet, vortex, vortex-compact, duckdb, datafusio...	12s
sql / bench (polarsignals, polarsignals, PolarSignals Profiling, vortex, datafusion, vortex, datafusion...	9s
sql / bench (tpch-nvme-10, tpch, TPC-H SF=10 on NVME, parquet, vortex, vortex-compact, duckdb, datafusi...	12s
sql / bench (statpopgen, statpopgen, Statistical and Population Genetics, vortex-bench/data/statpopgen,...	10s
bench (compress-bench, Compression, --features lance, parquet,lance,vortex)	8s
sql / bench (fineweb, fineweb, FineWeb NVMe, parquet, vortex, vortex-compact, datafusion, parquet, data...	14s
sql / bench (tpch-s3, tpch, TPC-H SF=1 on S3, vortex-bench/data/tpch/1.0, s3://vortex-ci-benchmark-data...	14s
sql / bench (fineweb-s3, fineweb, FineWeb S3, vortex-bench/data/fineweb, s3://vortex-ci-benchmark-datas...	9s
sql / bench (clickbench-nvme, clickbench, Clickbench on NVME, parquet, vortex, vortex-compact, duckdb, ...	7s
	3m 44s

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