build(deps): bump tower-test from `35188ec` to `251296d` #11271

Job	Run time
Build in release mode	2m 2s
Run unit tests	3m 47s
Check rustfmt style	25s
Subgraph Runner integration tests	3m 31s
Clippy linting	2m 17s
Run integration tests	4m 41s
	16m 43s

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