Use default Buramu map entries

Fixes the clippy::unwrap_or_default lint error reported by Clippy 1.98.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: aaf47101-2cb9-4d38-9f6a-e492c4da4135

Author: paldepind

ql/buramu/src/main.rs

@@ -38,10 +38,7 @@ fn get_files_with_deprecations() -> FileDeprecations {
     let mut file_deprecations: FileDeprecations = HashMap::new();
     for line in output.stdout.lines() {
         let (file, lineno) = get_filename_and_lineno(&line.unwrap());
-        file_deprecations
-            .entry(file)
-            .or_insert_with(Vec::new)
-            .push(lineno);
+        file_deprecations.entry(file).or_default().push(lineno);
     }
     file_deprecations
 }