Auto merge of #19611 - Xanewok:bump-mozjs, r=jdm

Bump mozjs to 0.1.9

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Bumping rust-mozjs, which was updated in tandem ([here](f9664091b1)) with https://github.com/servo/servo/pull/19487, but the new version wasn't pulled in here.

r? @jdm

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components/script/Cargo.toml

@@ -65,7 +65,7 @@ metrics = {path = "../metrics"}
 mitochondria = "1.1.2"
 mime = "0.2.1"
 mime_guess = "1.8.0"
-mozjs = { version = "0.1.8", features = ["promises"]}
+mozjs = { version = "0.1.9", features = ["promises"]}
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
 nonzero = {path = "../nonzero"}