Update Rust crate proptest to 1.8.0

Author: oxide-renovate[bot]

Cargo.toml

@@ -30,7 +30,7 @@ hashbrown = { version = "0.16.0", default-features = false, features = ["allocat
 hugealloc = "0.1.1"
 iddqd = { path = "crates/iddqd", default-features = false }
 iddqd-test-utils = { path = "crates/iddqd-test-utils" }
-proptest = { version = "1.7.0", default-features = false, features = ["std"] }
+proptest = { version = "1.8.0", default-features = false, features = ["std"] }
 ref-cast = "1.0.24"
 rustc-hash = { version = "2.1.1", default-features = false }
 schemars = "0.8.22"