v1.3.0 to fix accuracy bug

### Releases v1.3.0

1. Fix `poor-timer-accuracy` bug. Check [Poor accuracy on timer interrupt frequency or interval. #4](khoih-prog/MBED_RPI_PICO_TimerInterrupt#4)

Author: khoih-prog

examples/multiFileProject/multiFileProject.ino

@@ -15,8 +15,8 @@
   #error This code is intended to run on the MBED RP2040 mbed_nano or mbed_rp2040 platform! Please check your Tools->Board setting.
 #endif
 
-#define MBED_RP2040_SLOW_PWM_VERSION_MIN_TARGET      "RP2040_Slow_PWM v1.2.1"
-#define MBED_RP2040_SLOW_PWM_VERSION_MIN             1002001
+#define MBED_RP2040_SLOW_PWM_VERSION_MIN_TARGET      "RP2040_Slow_PWM v1.3.0"
+#define MBED_RP2040_SLOW_PWM_VERSION_MIN             1003000
 
 // To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
 #include "MBED_RP2040_Slow_PWM.h"