[pdsl_core] Use a special git repo for parity-codec for the moment

This is required because of some special impls for pDSL that while not being mandatory, they are still important enough to serve usability.

pdsl_core/Cargo.toml

@@ -18,12 +18,18 @@ categories = ["no-std", "embedded"]
 include = ["/Cargo.toml", "src/**/*.rs", "/README.md", "/LICENSE"]
 
 [dependencies]
-parity-codec = { version = "2.0.4", default-features = false }
 hashbrown = { version = "0.1.7", features = ["nightly"] }
 tiny-keccak = "1.4"
 log = "0.4"
 wee_alloc = "0.4"
 
+[dependencies.parity-codec]
+version = "2.0"
+default-features = false
+features = ["derive"]
+git = "https://github.com/robbepop/parity-codec"
+branch = "pdsl_impl"
+
 [features]
 default = []
 test-env = ["std"]