fix(tee): lowercase enum tee types

We encountered an issue where the staging environment was unable to
deserialize "sgx" to TeeType::Sgx. Relevant code:
- https://github.com/matter-labs/zksync-era/blob/87b02e3ab5c1f61d59dd0f0eefa9ec33a7b55488/core/lib/basic_types/src/tee_types.rs#L7
- https://github.com/matter-labs/teepot/blob/537521f0ee2bd704fb839fe336f43f8aab5887df/bin/tee-key-preexec/src/main.rs#L53

core/lib/basic_types/src/tee_types.rs

@@ -2,8 +2,27 @@ use serde::{Deserialize, Serialize};
 use strum::{Display, EnumString};
 
 #[derive(Debug, Clone, Copy, PartialEq, EnumString, Display, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 #[non_exhaustive]
 pub enum TeeType {
-    #[strum(serialize = "sgx")]
     Sgx,
 }
+
+#[cfg(test)]
+mod tests {
+    use serde_json;
+
+    use super::TeeType;
+
+    #[test]
+    fn test_deserialize_teetype() {
+        let json_str = "\"sgx\"";
+        let tee_type: TeeType = serde_json::from_str(json_str).unwrap();
+        assert_eq!(tee_type, TeeType::Sgx);
+
+        for json_str in &["\"Sgx\"", "\"SGX\""] {
+            let result: Result<TeeType, _> = serde_json::from_str(json_str);
+            assert!(result.is_err());
+        }
+    }
+}