ci: use beta, add secondary nightly ci.

tests/rp/Cargo.toml

@@ -31,7 +31,7 @@ panic-probe = { version = "0.3.0", features = ["print-defmt"] }
 futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
 embedded-io-async = { version = "0.6.1" }
 embedded-storage = { version = "0.3" }
-static_cell = { version = "2", features = ["nightly"]}
+static_cell = "2"
 portable-atomic = { version = "1.5", features = ["critical-section"] }
 pio = "0.2"
 pio-proc = "0.2"

tests/rp/src/bin/cyw43-perf.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 teleprobe_meta::target!(b"rpi-pico");
 
 use cyw43_pio::PioSpi;

tests/rp/src/bin/ethernet_w5100s_perf.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 teleprobe_meta::target!(b"w5100s-evb-pico");
 teleprobe_meta::timeout!(120);