Fix bad merge in warn_uv_toml_masked_fields (#14767)

## Summary

The branch got stale and merged without flagging that this no longer
compiles.

crates/uv-settings/src/lib.rs

@@ -302,6 +302,7 @@ fn warn_uv_toml_masked_fields(options: &Options) {
                 fork_strategy,
                 dependency_metadata,
                 config_settings,
+                config_settings_package,
                 no_build_isolation,
                 no_build_isolation_package,
                 exclude_newer,
@@ -422,6 +423,9 @@ fn warn_uv_toml_masked_fields(options: &Options) {
     if config_settings.is_some() {
         masked_fields.push("config-settings");
     }
+    if config_settings_package.is_some() {
+        masked_fields.push("config-settings-package");
+    }
     if no_build_isolation.is_some() {
         masked_fields.push("no-build-isolation");
     }

crates/uv/tests/it/show_settings.rs

@@ -3870,6 +3870,7 @@ fn resolve_both_special_fields() -> anyhow::Result<()> {
                         publish_url: None,
                         authenticate: Auto,
                         ignore_error_codes: None,
+                        cache_control: None,
                     },
                 ],
                 flat_index: [],
@@ -3933,6 +3934,9 @@ fn resolve_both_special_fields() -> anyhow::Result<()> {
             config_setting: ConfigSettings(
                 {},
             ),
+            config_settings_package: PackageConfigSettings(
+                {},
+            ),
             python_version: None,
             python_platform: None,
             universal: false,