cargo: pin cortex-m from rust-embedded instead

tmplt · tmplt · commit 12f482af5aa6 · 2021-11-27T14:10:21.000+01:00
rust-embedded/cortex-m#363 and rust-embedded/cortex-m#342 have been merged.
diff --git a/itm/Cargo.toml b/itm/Cargo.toml
@@ -27,6 +27,5 @@ optional = true
 
 [dependencies.cortex-m]
 version = "0.7"
-git = "https://github.com/rtic-scope/cortex-m"
-branch = "itm-rewrite"
+git = "https://github.com/rust-embedded/cortex-m"
 features = ["serde"]
