build(deps): bump tower-test from `251296d` to `df06d70` #11872

Job	Run time
Build in release mode	1m 58s
Check rustfmt style	35s
Clippy linting	2m 19s
Subgraph Runner integration tests	3m 13s
Run unit tests	3m 28s
Run integration tests	4m 31s
	16m 4s

Provide feedback