Bump defmt from 0.3.5 to 0.3.6 in /examples/stm32f4-event-printer

Bumps [defmt](https://github.com/knurling-rs/defmt) from 0.3.5 to 0.3.6.
- [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-v0.3.5...defmt-print-v0.3.6)

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

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

Author: dependabot[bot]

examples/stm32f4-event-printer/Cargo.lock

@@ -13,7 +13,7 @@ stm32f4xx-hal = { version = "0.19", features = ["stm32f401", "rtic", "rtic-monot
 
 fugit = "0.3"
 
-defmt = "0.3.5"
+defmt = "0.3.6"
 defmt-rtt = "0.4"
 
 # use `adafruit-bluefruit-protocol = "0.1"` in reality; path used here to ensure that the example always compiles against the latest master