chore(rust): Bump test-with from 0.15.5 to 0.15.6 in /rust (#3783)

Bumps [test-with](https://github.com/yanganto/test-with) from 0.15.5 to
0.15.6.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

rust/Cargo.lock

@@ -52,4 +52,4 @@ regex = { version = "1.12.2", default-features = false, optional = true }
 url = "2.5.7"
 
 [dev-dependencies]
-test-with = { version = "0.15.5", default-features = false }
+test-with = { version = "0.15.6", default-features = false }