Fix file corruption in Electric.Utils.external_merge_sort() (#2350) #2315

Job	Run time
List packages	4s
List examples	5s
Build and test (packages/experimental)	1m 20s
Build and test (packages/typescript-client)	1m 21s
Check packages/experimental	48s
Build and test (packages/react-hooks)	1m 12s
Check packages/typescript-client	39s
Check packages/react-hooks	38s
Check and build examples/react	43s
Check and build examples/todo-app	51s
Check and build examples/remix	45s
Check and build examples/encryption	43s
Check and build examples/gatekeeper-auth	43s
Check and build examples/tanstack	48s
Check and build examples/.shared	43s
Check and build examples/linearlite	52s
Check and build examples/bash	41s
Check and build examples/linearlite-read-only	58s
Check and build examples/nextjs	1m 7s
Check and build examples/yjs	1m 13s
Check and build examples/write-patterns	49s
Check and build examples/redis	37s
Check and build examples/proxy-auth	1m 1s
	18m 41s

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