ci: raise legacy adc high/low test low thresh
#elif CONFIG_IDF_TARGET_ESP32C3
#define ADC_TEST_LOW_VAL 0
-#define ADC_TEST_LOW_THRESH 30
+#define ADC_TEST_LOW_THRESH 50
#define ADC_TEST_HIGH_VAL 4095
#define ADC_TEST_HIGH_THRESH 10
