Update platformIO to 6.9.0 (Contains ESP IDF 5.3.1)

code/platformio.ini

@@ -20,7 +20,7 @@
 [common:esp32-idf]
     extends = common:idf
     ; PlatformIO releases, see https://github.com/platformio/platform-espressif32/releases
-    platform = platformio/espressif32 @ 6.8.1
+    platform = platformio/espressif32 @ 6.9.0
     framework = espidf
     lib_deps = 
         ${common:idf.lib_deps}