[core] fix capitalisation of "pin" (#19405)

esphome/pins.py

@@ -272,7 +272,7 @@ def check_strapping_pin(conf, strapping_pin_list: set[int], logger: Logger):
     num = conf[CONF_NUMBER]
     if num in strapping_pin_list and not conf.get(CONF_IGNORE_STRAPPING_WARNING):
         logger.warning(
-            "GPIO%s is a strapping PIN and should only be used for I/O with care.\n"
+            "GPIO%s is a strapping pin and should only be used for I/O with care.\n"
             "Attaching external pullup/down resistors to strapping pins can cause unexpected failures.\n"
             "See https://esphome.io/guides/faq/#why-am-i-getting-a-warning-about-strapping-pins",
             num,

tests/component_tests/esp32/test_esp32.py

@@ -1457,7 +1457,7 @@ def test_esp32_s31_gpio_validation(
     pin = {CONF_NUMBER: 36, CONF_MODE: input_mode}
     with caplog.at_level("WARNING"):
         validate_supports(pin)
-    assert "GPIO36 is a strapping PIN" in caplog.text
+    assert "GPIO36 is a strapping pin" in caplog.text
 
 
 _TLS_SERVER_OPTIONS = (