bump dependencies' versions

.cargo/config

.gdbinit

.gitignore

Cargo.toml

Xargo.toml

examples/blinky.rs

examples/concurrency.rs

examples/hello.rs

examples/itm.rs

examples/led.rs

examples/loopback.rs

examples/preemption.rs

examples/resource.rs

examples/roulette.rs

src/led.rs

src/lib.rs

src/serial.rs

src/timer.rs