Disable default features

Author: bugadani

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Changed
+- embedded-test no longer enables default `heapless` and `serde-json-core` features.
+- the panic handler should no longer use `defmt::Display2Format`.
+
 ## [0.6.1]
 
 ### Added

Cargo.lock

@@ -15,8 +15,8 @@ default-target = "riscv32imac-unknown-none-elf"
 semihosting = { version = "0.1.7", features = ["args"], optional = true }
 embedded-test-macros = { version = "0.6.1", path = "./macros" }
 serde = { version = "1.0.193", default-features = false, features = ["derive"] }
-serde-json-core = "0.6.0"
-heapless = "0.8.0"
+serde-json-core = { version = "0.6.0", default-features = false }
+heapless = { version = "0.8.0", default-features = false }
 
 # Optional dependencies
 defmt = { version = "1", optional = true }