Fix memory leak in duckdb_arrow_scan #4

Job	Run time
Windows (64 Bit)	29m 25s
MinGW (64 Bit)	1s
Windows (ARM64)	1s
Windows (32 Bit)	1s
Windows Extensions (64-bit)	1s
Upload windows_amd64 Extensions	-1s
win-packaged-upload	1s
	29m 29s

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