Bump esp-bootloader-esp-idf from 0.5.0 to 0.6.0 in /firmware

Bumps [esp-bootloader-esp-idf](https://github.com/esp-rs/esp-hal) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/esp-rs/esp-hal/releases)
- [Commits](esp-rs/esp-hal@esp-bootloader-esp-idf-v0.5.0...esp-bootloader-esp-idf-v0.6.0)

---
updated-dependencies:
- dependency-name: esp-bootloader-esp-idf
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

firmware/Cargo.lock

@@ -20,7 +20,7 @@ vaultkey-core = { path = "../../core" }
 
 # Everything below is what this chip needs; the key itself knows none of it.
 esp-hal = { version = "1.2.0", features = ["esp32c6", "rt", "unstable"] }
-esp-bootloader-esp-idf = { version = "0.5.0", features = ["esp32c6"] }
+esp-bootloader-esp-idf = { version = "0.6.0", features = ["esp32c6"] }
 esp-println = { version = "0.18.0", default-features = false, features = ["esp32c6", "jtag-serial", "critical-section"] }
 esp-backtrace = { version = "0.20.0", features = ["esp32c6", "panic-handler", "println"] }
 esp-storage = { version = "0.10.0", features = ["esp32c6", "embedded-storage"] }