Fix oss fuzz isue

Signed-off-by: Wei Liu <[email protected]>

src/crypto/fuzz/Cargo.toml

@@ -14,6 +14,7 @@ afl = {version = "*", optional = true }
 log = "0.4.13"
 arbitrary = "=1.1.3"
 der = {version = "0.5.1", features = ["oid", "alloc", "derive"]}
+serde = "=1.0.198"
 
 [dependencies.crypto]
 path = ".."