Fix CI from upstream changes:

 - new rustc compiler error for unexpected cfg names
 - puffin making a non-semver friendly change, it needs to be pinned to 0.19.0 or upgraded

demo-puffin/Cargo.toml

@@ -20,7 +20,8 @@ categories = ["development-tools::profiling"]
 [dependencies]
 profiling = { path = "../profiling", features = ["profile-with-puffin"] }
 
-puffin = "0.19.0"
+# Pinned to 0.19.0 because 0.19.1 made a breaking change
+puffin = "=0.19.0"
 puffin_egui = "0.26.0"
 egui = "0.26.2"
 # wgpu also works fine here

demo-puffin/src/main.rs

@@ -45,10 +45,6 @@ fn some_other_function(iterations: usize) {
                 format!("other data {}", i).as_str()
             );
 
-            // Mixing general profiling API calls with profiler-specific API calls is allowed
-            #[cfg(feature = "profile-with-optick")]
-            profiling::optick::tag!("extra_data", "MORE DATA");
-
             some_inner_function(i);
             burn_time(1);
         }