rust: pin serde version

because oss-fuzz does not support newer rust nightly
and newer serde does not support oss-fuzz old nightly

rust/Cargo.toml.in

@@ -65,6 +65,10 @@ ldap-parser = { version = "~0.4.0" }
 
 time = "~0.3.36"
 
+# pinned until oss-fuzz supports newer rust nightly cf https://github.com/google/oss-fuzz/pull/12365
+serde = { version = "=1.0.197" }
+serde_derive = { version = "1.0.197" }
+
 suricata-derive = { path = "./derive", version = "@PACKAGE_VERSION@" }
 
 suricata-lua-sys = { git = "https://github.com/jasonish/suricata-lua-sys", version = "0.1.0-alpha.1" }