Update mfrc522 requirement from 0.6.0 to 0.7.0 (#36)

Updates the requirements on [mfrc522](https://gitlab.com/jspngh/rfid-rs) to permit the latest version.
- [Commits](https://gitlab.com/jspngh/rfid-rs/compare/v0.6.0...v0.7.0)

---
updated-dependencies:
- dependency-name: mfrc522
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -35,7 +35,7 @@ crc16 = { version = "0.4.0", default-features = false }
 either = { version = "1.9.0", default-features = false }
 heapless = "0.8.0"
 m = "0.1.1"
-mfrc522 = "0.6.0"
+mfrc522 = "0.7.0"
 panic-halt = "0.2.0"
 panic-itm = "0.4.2"
 panic-semihosting = "0.6.0"