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>

Cargo.lock

@@ -1150,7 +1150,7 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
 dependencies = [
- "nom",
+ "nom 7.1.3",
 ]
 
 [[package]]
@@ -5427,7 +5427,7 @@ dependencies = [
  "mime",
  "mime_guess",
  "net_traits",
- "nom",
+ "nom 8.0.0",
  "pixels",
  "profile_traits",
  "rayon",
@@ -5536,6 +5536,15 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "nom"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df9761775871bdef83bee530e60050f7e54b1105350d6884eb0fb4f46c2f9405"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.46.0"
@@ -7167,7 +7176,7 @@ dependencies = [
  "mozangle",
  "mozjs",
  "net_traits",
- "nom",
+ "nom 8.0.0",
  "num-traits",
  "num_cpus",
  "parking_lot",