Revert "chore: bump ci-esp32-arduino-2 platform version"

This reverts commit bf007c38fa118bdb45b905aeb6e50b9151c694fc.

platformio.ini

@@ -64,7 +64,7 @@ lib_deps =
   ${env.lib_deps}
 
 [env:ci-esp32-arduino-2]
-platform = espressif32@6.12.0
+platform = espressif32@6.7.0
 board = ${sysenv.PIO_BOARD}
 lib_deps = 
   esp32async/AsyncTCP@^3.4.9