reorder serde usage/derive

this is deprecated with rustc 1.52+, and will become a hard error at
some point:

https://github.com/rust-lang/rust/issues/79202

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/server/jobstate.rs

@@ -61,8 +61,8 @@ use crate::{
     },
 };
 
-#[serde(rename_all = "kebab-case")]
 #[derive(Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
 /// Represents the State of a specific Job
 pub enum JobState {
     /// A job was created at 'time', but never started/finished