Bump embedded-io from 0.6.1 to 0.7.1

Bumps [embedded-io](https://github.com/rust-embedded/embedded-hal) from 0.6.1 to 0.7.1.
- [Release notes](https://github.com/rust-embedded/embedded-hal/releases)
- [Commits](rust-embedded/embedded-hal@embedded-io-v0.6.1...embedded-io-v0.7.1)

---
updated-dependencies:
- dependency-name: embedded-io
  dependency-version: 0.7.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -9,7 +9,7 @@ panic-halt = "1.0.0"
 defmt-rtt = "1.0"
 nb = "1.1.0"
 embedded-hal = "1.0.0"
-embedded-io = "0.6.1"
+embedded-io = "0.7.1"
 
 [dependencies.microbit]
 path = "../../microbit"