chore(deps): bump heapless from 0.8.0 to 0.9.1

Bumps [heapless](https://github.com/rust-embedded/heapless) from 0.8.0 to 0.9.1.
- [Release notes](https://github.com/rust-embedded/heapless/releases)
- [Changelog](https://github.com/rust-embedded/heapless/blob/main/CHANGELOG.md)
- [Commits](rust-embedded/heapless@v0.8.0...v0.9.1)

---
updated-dependencies:
- dependency-name: heapless
  dependency-version: 0.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -19,7 +19,7 @@ esp-backtrace = { version = "0.15.1", features = [
 esp-hal = { version = "0.23.1", features = ["esp32c3", "log"] }
 esp-println = { version = "0.13.1", features = ["esp32c3", "log"] }
 log = { version = "0.4.27" }
-heapless = "0.8.0"
+heapless = "0.9.1"
 display-interface-spi = "0.5.0"
 embedded-graphics = "0.8.1"
 embedded-hal-bus = "0.3.0"