Test: update Atmel packs to latest version

Author: facchinm

build.conf

@@ -1,5 +1,5 @@
 AVR_VERSION=3.6.1
-BUILD_NUMBER=arduino5
+BUILD_NUMBER=arduino6
 
 AVR_SOURCES="http://downloads.arduino.cc/tools/opensource/Atmel-AVR-GNU-Toolchain/${AVR_VERSION}"
 ATMEL_PACKS_SOURCES="http://packs.download.atmel.com/"
@@ -19,11 +19,11 @@ MPC_SOURCES="http://repository.timesys.com/buildsources/m/mpc/"
 GCC_VERSION=7.3.0
 MPFR_VERSION=3.1.0
 
-ATMEL_ATMEGA_PACK_VERSION=1.3.300
+ATMEL_ATMEGA_PACK_VERSION=1.4.351
 ATMEL_ATMEGA_PACK_FILENAME=Atmel.ATmega_DFP.${ATMEL_ATMEGA_PACK_VERSION}
 ATMEL_ATMEGA_PACK_URL=${ATMEL_PACKS_SOURCES}/${ATMEL_ATMEGA_PACK_FILENAME}.atpack
 
-ATMEL_ATTINY_PACK_VERSION=1.3.229
+ATMEL_ATTINY_PACK_VERSION=1.4.310
 ATMEL_ATTINY_PACK_FILENAME=Atmel.ATtiny_DFP.${ATMEL_ATTINY_PACK_VERSION}
 ATMEL_ATTINY_PACK_URL=${ATMEL_PACKS_SOURCES}/${ATMEL_ATTINY_PACK_FILENAME}.atpack