Update minimum serde version

Without this, we cannot build with `-Z minimal-versions`

Cargo.toml

@@ -32,7 +32,7 @@ once_cell = "1"
 futures-util = "0.3"
 num = "0.4.0"
 rand = "0.8.1"
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0.103", features = ["derive"] }
 sha2 = { version = "0.10.0", optional = true }
 zbus = { version = "3.7", default-features = false }
 openssl = { version = "^0.10.40", optional = true }