Fix missing include

include/ls-std/encoding/Base64.hpp

@@ -3,7 +3,7 @@
  * Company:         Lynar Studios
  * E-Mail:          webmaster@lynarstudios.com
  * Created:         2022-01-03
- * Changed:         2023-05-15
+ * Changed:         2024-09-05
  *
  * */
 
@@ -11,6 +11,7 @@
 #define LS_STD_BASE64_HPP
 
 #include <bitset>
+#include <cstdint>
 #include <ls-std/core/interface/IEncoding.hpp>
 #include <ls-std/os/dynamic-goal.hpp>
 #include <string_view>