build(deps): bump tower-test from `251296d` to `df06d70` #11873

Job	Run time
Check rustfmt style	40s
Run integration tests	3m 58s
Build in release mode	1m 49s
Subgraph Runner integration tests	3m 2s
Clippy linting	2m 12s
Run unit tests	4m 9s
	15m 50s

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