ref: rename gpa usages to the aliased DebugAllocator

examples/styles/palette.zig

@@ -27,7 +27,7 @@ const QuitText = struct {
 pub fn main() !void {
     errdefer |err| log.err("Application Error: {any}", .{err});
 
-    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
     defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
 
     const allocator = gpa.allocator();