fix(schemas): Make lints.workspace not required

Author: epage

crates/cargo-util-schemas/manifest.schema.json

@@ -951,9 +951,6 @@
           "type": "boolean"
         }
       },
-      "required": [
-        "workspace"
-      ],
       "additionalProperties": {
         "type": "object",
         "additionalProperties": {

crates/cargo-util-schemas/src/manifest/mod.rs

@@ -1525,6 +1525,7 @@ impl TomlPlatform {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 pub struct InheritableLints {
     #[serde(skip_serializing_if = "is_false")]
+    #[cfg_attr(feature = "unstable-schema", schemars(default))]
     pub workspace: bool,
     #[serde(flatten)]
     pub lints: TomlLints,