[Renderers/Raylib] Reuse memory in raylib renderer for temporary string allocations

examples/introducing-clay-video-demo/main.c

@@ -50,4 +50,6 @@ int main(void) {
         Clay_Raylib_Render(renderCommands, fonts);
         EndDrawing();
     }
+    // This function is new since the video was published
+    Clay_Raylib_Close();
 }

examples/raylib-multi-context/main.c

@@ -72,4 +72,6 @@ int main(void) {
         Clay_Raylib_Render(renderCommandsBottom, fonts);
         EndDrawing();
     }
+
+    Clay_Raylib_Close();
 }

examples/raylib-sidebar-scrolling-container/main.c

@@ -250,5 +250,6 @@ int main(void) {
         }
         UpdateDrawFrame(fonts);
     }
+    Clay_Raylib_Close();
     return 0;
 }