tweak(app-lib): improve consistency of skin field serialization case

packages/app-lib/src/api/minecraft_skins.rs

@@ -103,6 +103,7 @@ impl Skin {
 }
 
 #[derive(Deserialize, Serialize, Debug)]
+#[serde(rename_all = "snake_case")]
 pub enum SkinSource {
     /// A default Minecraft skin, which may be assigned to players at random by default.
     Default,

packages/app-lib/src/state/minecraft_auth.rs

@@ -1127,7 +1127,7 @@ async fn minecraft_token(
 #[derive(
     sqlx::Type, Deserialize, Serialize, Debug, Copy, Clone, PartialEq, Eq,
 )]
-#[serde(rename_all(deserialize = "UPPERCASE"))]
+#[serde(rename_all = "UPPERCASE")]
 #[sqlx(rename_all = "UPPERCASE")]
 pub enum MinecraftSkinVariant {
     /// The classic player model, with arms that are 4 pixels wide.
@@ -1141,7 +1141,7 @@ pub enum MinecraftSkinVariant {
 }
 
 #[derive(Deserialize, Serialize, Debug, Copy, Clone, PartialEq, Eq)]
-#[serde(rename_all(deserialize = "UPPERCASE"))]
+#[serde(rename_all = "UPPERCASE")]
 pub enum MinecraftCharacterExpressionState {
     /// This expression is selected for being displayed ingame.
     ///