Bump defmt in /examples/stm32f4-single-motor-example

Bumps [defmt](https://github.com/knurling-rs/defmt) from 0.3.8 to 0.3.10.
- [Release notes](https://github.com/knurling-rs/defmt/releases)
- [Changelog](https://github.com/knurling-rs/defmt/blob/main/CHANGELOG.md)
- [Commits](knurling-rs/defmt@defmt-v0.3.8...defmt-v0.3.10)

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

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

examples/stm32f4-single-motor-example/Cargo.toml

@@ -11,7 +11,7 @@ panic-probe = { version = "0.3", features = ["print-defmt"] }
 
 stm32f4xx-hal = { version = "0.22", features = ["stm32f401", "rtic1"] }
 
-defmt = "0.3.6"
+defmt = "0.3.10"
 defmt-rtt = "0.4"
 
 # use `tb6612fng = "0.1"` in reality; path used here to ensure that the example always compiles against the latest master