Bugfix/fix sonarcube findings (#6369)

* Fix sonarcube findings.
---------
Co-authored-by: Kim Kulling <kim.kulling@draeger.com>

code/PostProcessing/EmbedTexturesProcess.h

@@ -58,7 +58,7 @@ namespace Assimp {
  *  it will check if a file with the same name exists at the root folder
  *  of the imported model. And if so, it uses that.
  */
-class ASSIMP_API EmbedTexturesProcess : public BaseProcess {
+class ASSIMP_API EmbedTexturesProcess final : public BaseProcess {
 public:
     /// The default class constructor.
     EmbedTexturesProcess() = default;