fix(esp32): float conversion warning in String::toFloat #5343

Job	Run time
Push event file	4s
Generate matrix	6s
Build (validation, esp32) / Build validation tests for esp32	5m 13s
Build (validation, esp32s3) / Build validation tests for esp32s3	6m 9s
Build (validation, esp32s2) / Build validation tests for esp32s2	4m 57s
Build (validation, esp32c6) / Build validation tests for esp32c6	5m 13s
Build (validation, esp32c3) / Build validation tests for esp32c3	3m 43s
Build (validation, esp32p4) / Build validation tests for esp32p4	4m 9s
Build (validation, esp32h2) / Build validation tests for esp32h2	3m 41s
Hardware	-1s
QEMU	-1s
	33m 13s

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