Fix build

Signed-off-by: crueter <crueter@eden-emu.dev>

src/shader_recompiler/stage.h

@@ -20,8 +20,8 @@ enum class Stage : u32 {
 };
 constexpr u32 MaxStageTypes = 6;
 
-[[nodiscard]] constexpr Stage StageFromIndex(size_t index) noexcept {
-    return static_cast<Stage>(static_cast<size_t>(Stage::VertexB) + index);
+[[nodiscard]] constexpr Stage StageFromIndex(std::size_t index) noexcept {
+    return static_cast<Stage>(static_cast<std::size_t>(Stage::VertexB) + index);
 }
 
 } // namespace Shader