build: Bump heapless from 0.9.2 to 0.9.3

Bumps [heapless](https://github.com/rust-embedded/heapless) from 0.9.2 to 0.9.3.
- [Release notes](https://github.com/rust-embedded/heapless/releases)
- [Changelog](https://github.com/rust-embedded/heapless/blob/main/CHANGELOG.md)
- [Commits](rust-embedded/heapless@v0.9.2...v0.9.3)

---
updated-dependencies:
- dependency-name: heapless
  dependency-version: 0.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -29,7 +29,7 @@ efi-var = []
 bitflags = "2.11.1"
 atomic_refcell = "0.1.14"
 r-efi = { version = "5.3.0", features = ["efiapi"] }
-heapless = "0.9.2"
+heapless = "0.9.3"
 log = "0.4.29"
 
 [target.'cfg(target_arch = "aarch64")'.dependencies]