Fix raspberry pi pico example not compiling (#4034)

* Fix raspberry pi pico example not compiling

* Update dependencies for raspberry pi pico

* Update deps in raspberry-pi-pico

* Remove raspberry-pi-pico from workspace

* Fix lints for run_model

Author: BjornTheProgrammer

Cargo.toml

@@ -16,7 +16,7 @@ members = [
 
 exclude = [
     "examples/notebook",
-    "examples/raspberry-pi-pico",        # will cause xtask issues otherwise
+    "examples/raspberry-pi-pico",
     "crates/burn-import/model-checks/*", # exclude model checking crates from workspace
 ]
 

crates/burn-core/Cargo.toml

@@ -128,7 +128,7 @@ burn-fusion = { path = "../burn-fusion", version = "=0.20.0-pre.4", optional = t
 
 [target.'cfg(not(target_has_atomic = "ptr"))'.dependencies]
 portable-atomic-util = { workspace = true }
-portable-atomic = { workspace = true, features = ["unsafe-assume-single-core"] }
+portable-atomic = { workspace = true }
 
 [dev-dependencies]
 burn-ndarray = { path = "../burn-ndarray", version = "=0.20.0-pre.4" }