chore: Prepare for Rust edition bump to 2024 (without autofix) (#27791)

Successor to #27779 - in this PR I've applied changes manually, without
futzing with if let lifetimes at all.

Release Notes:

- N/A

crates/project/src/task_inventory.rs

@@ -392,7 +392,7 @@ impl Inventory {
                         }
                     },
                     message: format!("Failed to parse tasks file content as a JSON array: {e}"),
-                })
+                });
             }
         };
         let new_templates = raw_tasks