Update panic-semihosting requirement from 0.5.6 to 0.6.0 (#136)

Updates the requirements on [panic-semihosting](https://github.com/rust-embedded/cortex-m) to permit the latest version.
- [Release notes](https://github.com/rust-embedded/cortex-m/releases)
- [Changelog](https://github.com/rust-embedded/cortex-m/blob/master/CHANGELOG.md)
- [Commits](rust-embedded/cortex-m@v0.5.6...v0.6.0)

---
updated-dependencies:
- dependency-name: panic-semihosting
  dependency-type: direct:production
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Cargo.toml

@@ -61,7 +61,7 @@ version = "0.2.7"
 
 [dev-dependencies]
 panic-halt = "0.2.0"
-panic-semihosting = "0.5.6"
+panic-semihosting = "0.6.0"
 panic-itm = "0.4.2"
 cortex-m-rtfm = "0.5.3"
 cortex-m-semihosting = "0.5.0"