Merge rust-bitcoin#4306: chore: remove unused cortex-m dependency

dab5774 chore: remove unused cortex-m dependency from embedded Cargo.toml files in bitcoin and hashes modules. (lfgtwo)

Pull request description:

ACKs for top commit:
  tcharding:
    ACK dab5774
  Kixunil:
    ACK dab5774

Tree-SHA512: 77e852313f067d10241b47db3516716344383a670011e56f7b7ffadbcdb82787aac3800971d13e3160b4d1f533b71398c2bfaa0f6e47dc24d4c8a1d7d82e2405

Author: apoelstra

bitcoin/embedded/Cargo.toml

@@ -10,10 +10,8 @@ version = "0.1.0"
 members = ["."]
 
 [dependencies]
-cortex-m = "0.6.0"
 cortex-m-rt = "0.6.10"
 cortex-m-semihosting = "0.3.3"
-panic-halt = "0.2.0"
 alloc-cortex-m = "0.4.1"
 bitcoin = { path="../", default-features = false, features = ["secp-lowmemory"] }
 

hashes/embedded/Cargo.toml

@@ -14,7 +14,6 @@ alloc = ["alloc-cortex-m", "bitcoin_hashes/alloc"]
 hex = ["bitcoin_hashes/hex"]
 
 [dependencies]
-cortex-m = "0.6.0"
 cortex-m-rt = "0.6.10"
 cortex-m-semihosting = "0.3.3"
 panic-halt = "0.2.0"