LibDebug: Convert LibDebug to east-const style

Author: https://github.com/itamar8910
Commit: 3a4017b419
Pull-request: https://github.com/SerenityOS/serenity/pull/8149
Reviewed-by: https://github.com/gunnarbeutner

Userland/Libraries/LibDebug/Dwarf/LineProgram.h

@@ -114,7 +114,7 @@ public:
         size_t line { 0 };
     };
 
-    const Vector<LineInfo>& lines() const { return m_lines; }
+    Vector<LineInfo> const& lines() const { return m_lines; }
 
     struct DirectoryAndFile {
         FlyString directory;