Update Nom to 8.0.0 (#38585)

There are two relevant breaking changes:
* instead of `)(input)`, we now need to call `).parse(input)`
* tuples are no longer a call, but a `()` call.

There is one other usage of nom 7, however that's in the build
dependencies list of mozangle via bindgen. Therefore, we won't have
duplicate nom versions in Servo binary.

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

deny.toml

@@ -189,6 +189,11 @@ skip = [
 
     # duplicated by zbus-xml
     "quick-xml",
+
+    # duplicated by bindgen as build dependency
+    # Remove when cexpr updates its nom version
+    # and bindgen updates the cexpr version
+    "nom",
 ]
 
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