Select ESP8266 framework version via platform

By explicitly listing an unversioned framework dependency in
'platform_packages', we were overriding the selection via the 'platform'
specification, allowing PlatformIO to select any random version.
Remove this line to allow 'platform' to add the framework dependency
with the expected version.

platformio.ini

@@ -41,8 +41,7 @@ arduino_core_git = https://github.com/platformio/platform-espressif8266#feature/
 platform_wled_default = ${common.arduino_core_3_1_2}
 # We use 2.7.4.7 for all, includes PWM flicker fix and Wstring optimization
 #platform_packages = tasmota/framework-arduinoespressif8266 @ 3.20704.7
-platform_packages = platformio/framework-arduinoespressif8266
-                    platformio/toolchain-xtensa @ ~2.100300.220621 #2.40802.200502
+platform_packages = platformio/toolchain-xtensa @ ~2.100300.220621 #2.40802.200502
                     platformio/tool-esptool #@ ~1.413.0
                     platformio/tool-esptoolpy #@ ~1.30000.0