chore: fix clippy warnings

Author: psteinroe

crates/pgls_splinter/src/convert.rs

@@ -1,4 +1,4 @@
-use pgls_diagnostics::{Category, DatabaseObjectOwned, Severity, category};
+use pgls_diagnostics::{DatabaseObjectOwned, Severity};
 use serde_json::Value;
 
 use crate::{SplinterAdvices, SplinterDiagnostic, SplinterQueryResult};

xtask/codegen/src/generate_splinter.rs

@@ -90,8 +90,8 @@ fn extract_metadata_from_sql(sql_path: &Path, category: &str) -> Result<SqlRuleM
             break; // Stop at first non-comment line
         }
 
-        if line.starts_with("-- meta:") {
-            let meta_line = &line[8..].trim(); // Remove "-- meta:"
+        if let Some(stripped) = line.strip_prefix("-- meta:") {
+            let meta_line = &stripped.trim();
 
             if let Some(value) = extract_meta_value(meta_line, "name") {
                 name = Some(value);