ci: revert invalid PartitionScheme=custom; rely on sketch-adjacent partitions.csv auto-pickup

arduino-esp32 core does not define a 'custom' PartitionScheme menu option on
any board. The core's prebuild hook already copies partitions.csv from next
to the .ino file into the build dir when present, so no menu override is
needed.

.github/workflows/ci.yaml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 env:
   ARDUINO_BOARD_MANAGER_ADDITIONAL_URLS: "https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json"
   ARDUINO_CLI_VERSION: "0.x"
-  ARDUINO_ESP32_VERSION: "2.0.17"
+  ARDUINO_ESP32_VERSION: "2.0.10"
   ARDUINO_JSON_VERSION: "6.21.3"
   ESPTOOL_VERSION: "4.6"
   LITTLEFS_VERSION: "v2.5.1"
@@ -65,22 +65,22 @@ jobs:
           - board: esp32
             addr_bootloader: 0x1000
             chip: ESP32
-            fqbn: esp32:esp32:esp32:PartitionScheme=custom
+            fqbn: esp32:esp32:esp32
             name: ESP32
           - board: lolin_c3_mini
             addr_bootloader: 0x0
             chip: ESP32-C3
-            fqbn: esp32:esp32:lolin_c3_mini:PartitionScheme=custom
+            fqbn: esp32:esp32:lolin_c3_mini
             name: LOLIN-C3-mini
           - board: lolin_s2_mini
             addr_bootloader: 0x1000
             chip: ESP32-S2
-            fqbn: esp32:esp32:lolin_s2_mini:PartitionScheme=custom
+            fqbn: esp32:esp32:lolin_s2_mini
             name: LOLIN-S2-mini
           - board: lolin_s3_mini
             addr_bootloader: 0x0
             chip: ESP32-S3
-            fqbn: esp32:esp32:lolin_s3_mini:PartitionScheme=custom
+            fqbn: esp32:esp32:lolin_s3_mini
             name: LOLIN-S3-mini
 
     steps: