fix(schema): restore limit on line-length (#7883)

## Summary

Restores functionality of #7875 but in the correct place. Closes #7877.

~~I couldn't figure out how to get cargo fmt to work, so hopefully
that's run in CI.~~ Nevermind, figured it out.

## Test Plan

Can see output of json.

crates/ruff_linter/src/line_width.rs

@@ -15,7 +15,9 @@ use ruff_text_size::TextSize;
 /// The allowed range of values is 1..=320
 #[derive(Clone, Copy, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
-pub struct LineLength(NonZeroU16);
+pub struct LineLength(
+    #[cfg_attr(feature = "schemars", schemars(range(min = 1, max = 320)))] NonZeroU16,
+);
 
 impl LineLength {
     /// Maximum allowed value for a valid [`LineLength`]

ruff.schema.json

@@ -1556,6 +1556,7 @@
       "description": "The length of a line of text that is considered too long.\n\nThe allowed range of values is 1..=320",
       "type": "integer",
       "format": "uint16",
+      "maximum": 320.0,
       "minimum": 1.0
     },
     "LintOptions": {