Bug 1452603 - Update Cargo stuff for the serde bump. r=jrmuizel

MozReview-Commit-ID: HDxOYbIXcIN

--HG--
extra : rebase_source : 5e3fa7d72735b0e9c8adc4de552a637b35f368be

.cargo/config.in

@@ -9,7 +9,7 @@ replace-with = 'vendored-sources'
 
 [source."https://github.com/servo/serde"]
 git = "https://github.com/servo/serde"
-branch = "deserialize_from_enums5"
+branch = "deserialize_from_enums6"
 replace-with = "vendored-sources"
 
 [source.vendored-sources]

Cargo.toml

@@ -59,4 +59,4 @@ codegen-units = 1
 
 [patch.crates-io]
 libudev-sys = { path = "dom/webauthn/libudev-sys" }
-serde_derive = { git = "https://github.com/servo/serde", branch = "deserialize_from_enums5" }
+serde_derive = { git = "https://github.com/servo/serde", branch = "deserialize_from_enums6" }