chore(labrinth): more unrelated Clippy fixes

Author: AlexTMjugador

apps/labrinth/src/models/v3/billing.rs

@@ -189,8 +189,8 @@ impl ChargeType {
     pub fn as_str(&self) -> &'static str {
         match self {
             ChargeType::OneTime => "one-time",
-            ChargeType::Subscription { .. } => "subscription",
-            ChargeType::Proration { .. } => "proration",
+            ChargeType::Subscription => "subscription",
+            ChargeType::Proration => "proration",
             ChargeType::Refund => "refund",
         }
     }

apps/labrinth/src/routes/v2/version_creation.rs

@@ -188,7 +188,7 @@ pub async fn version_create(
                 // Handle project type via file extension prediction
                 let mut project_type = None;
                 for file_part in &legacy_create.file_parts {
-                    if let Some(ext) = file_part.split('.').last() {
+                    if let Some(ext) = file_part.split('.').next_back() {
                         match ext {
                             "mrpack" | "mrpack-primary" => {
                                 project_type = Some("modpack");

apps/labrinth/src/routes/v3/version_file.rs

@@ -191,7 +191,7 @@ pub async fn get_update_from_hash(
             })
             .sorted();
 
-            if let Some(first) = versions.last() {
+            if let Some(first) = versions.next_back() {
                 if !is_visible_version(
                     &first.inner,
                     &user_option,
@@ -523,7 +523,7 @@ pub async fn update_individual_files(
                             bool
                         })
                         .sorted()
-                        .last();
+                        .next_back();
 
                     if let Some(version) = version {
                         if is_visible_version(