Update Rust crate rstest to 0.26.0

Author: renovate[bot]

Cargo.lock

@@ -46,7 +46,7 @@ toml = { version = "0.8.22", optional = true }
 assert_matches = "1.5.0"
 async-std = { version = "1.13.1", features = ["attributes"], default-features = false }
 httpmock = { version = "0.7.0", default-features = false }
-rstest = "0.25.0"
+rstest = "0.26.0"
 serde_json = { version = "1.0.140", features = ["preserve_order"] }
 tempfile = "3.20.0"