RP2040: Update core; add mDNS support (#5355)

* Update arduino-pico core

* RP2040: Add mDNS support

* SimpleMDNS `begin` now returns a bool

* Add `-g` option to `debug_build_flags` to link files for gdb

* RAK11310 needs old platform as well

* Change defines to specific architecture

* Core version 4.2.1 is out

arch/rp2xx0/rp2040.ini

@@ -1,8 +1,8 @@
 ; Common settings for rp2040 Processor based targets
 [rp2040_base]
-platform = https://github.com/maxgerhardt/platform-raspberrypi.git#v1.2.0-gcc12
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git#a606be683748c73e9a0d46baf70163478d298f0f ; For arduino-pico 4.2.0
 extends = arduino_base
-platform_packages = framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git#4.0.3
+platform_packages = framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git#4.2.1
 
 board_build.core = earlephilhower
 board_build.filesystem_size = 0.5m
@@ -23,4 +23,4 @@ lib_deps =
   ${arduino_base.lib_deps}
   ${environmental_base.lib_deps}
   ${radiolib_base.lib_deps}
-  rweather/Crypto
+  rweather/Crypto

arch/rp2xx0/rp2350.ini

@@ -1,8 +1,8 @@
 ; Common settings for rp2040 Processor based targets
 [rp2350_base]
-platform = https://github.com/maxgerhardt/platform-raspberrypi.git#9e55f6db5c56b9867c69fe473f388beea4546672
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git#a606be683748c73e9a0d46baf70163478d298f0f ; For arduino-pico 4.2.0
 extends = arduino_base
-platform_packages = framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git#a6ab6e1f95bc1428d667d55ea7173c0744acc03c ; 4.0.2+
+platform_packages = framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git#4.2.1
 
 board_build.core = earlephilhower
 board_build.filesystem_size = 0.5m