fix: Add missing cstdint include (#1697)

Author: longnguyen2004

src/common/bit_depth.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <memory>
+#include <cstdint>
 
 namespace caspar { namespace common {
 
@@ -13,4 +14,4 @@ enum class bit_depth : uint8_t
     bit16,
 };
 
-}} // namespace caspar::common
+}} // namespace caspar::common