Fix warning regarding resolver

Edvin Åkerfeldt · Edvin Åkerfeldt · commit 831492354f31 · 2023-10-20T16:35:47.000+02:00
Resolver need to be set on workspace level. See rust-lang/cargo#10112
diff --git a/Cargo.toml b/Cargo.toml
@@ -3,3 +3,4 @@ members = [
     "mcan",
     "mcan-core",
 ]
+resolver = "2"
