Auto merge of #15735 - servo:cssparserup, r=emilio

Update cssparser to 0.11

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<s>Depends on https://github.com/servo/rust-cssparser/pull/122.</s>

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ports/geckolib/Cargo.toml

@@ -15,7 +15,7 @@ bindgen = ["style/use_bindgen"]
 [dependencies]
 app_units = "0.4"
 atomic_refcell = "0.1"
-cssparser = "0.10"
+cssparser = "0.11"
 env_logger = {version = "0.4", default-features = false} # disable `regex` to reduce code size
 euclid = "0.11"
 lazy_static = "0.2"