Bump embedded-hal from 0.2.4 to 0.2.7 in /rtic_v0.5/stm32l4_heartbeat

Bumps [embedded-hal](https://github.com/rust-embedded/embedded-hal) from 0.2.4 to 0.2.7.
- [Release notes](https://github.com/rust-embedded/embedded-hal/releases)
- [Changelog](https://github.com/rust-embedded/embedded-hal/blob/v0.2.7/CHANGELOG.md)
- [Commits](rust-embedded/embedded-hal@v0.2.4...v0.2.7)

---
updated-dependencies:
- dependency-name: embedded-hal
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

rtic_v0.5/stm32l4_heartbeat/Cargo.lock

@@ -11,7 +11,7 @@ edition = "2018"
 [dependencies]
 panic-semihosting = "0.6"
 cortex-m-semihosting = "0.5.0"
-embedded-hal = "0.2.3"
+embedded-hal = "0.2.7"
 cortex-m-rtic = { version = "0.5.9", default-features = false, features = ["cortex-m-7"] }
 stm32l4xx-hal = { version = "0.6.0", features = ["rt", "stm32l4x2"] }
 heapless = "0.7.16"