[rp2040] Bump arduino-pico framework to 5.6.0 (#16375)

platformio.ini

@@ -193,7 +193,7 @@ board_build.filesystem_size = 0.5m
 platform = https://github.com/maxgerhardt/platform-raspberrypi.git#v1.4.0-gcc14-arduinopico460
 platform_packages =
     ; earlephilhower/framework-arduinopico@~1.20602.0 ; Cannot use the platformio package until old releases stop getting deleted
-    earlephilhower/framework-arduinopico@https://github.com/earlephilhower/arduino-pico/releases/download/5.5.1/rp2040-5.5.1.zip
+    earlephilhower/framework-arduinopico@https://github.com/earlephilhower/arduino-pico/releases/download/5.6.0/rp2040-5.6.0.zip
 
 framework = arduino
 lib_deps =