🔨 Update LPC176x platform to 0.2.8 (#22333)

ini/lpc176x.ini

 #
 [common_LPC]
 platform          = https://github.com/p3p/pio-nxplpc-arduino-lpc176x/archive/0.1.3.zip
-platform_packages = framework-arduino-lpc176x@^0.2.6
+platform_packages = framework-arduino-lpc176x@^0.2.8
 board             = nxp_lpc1768
 lib_ldf_mode      = off
 lib_compat_mode   = strict