[quality] Use `uint8_t instead of unsigned char`

esphome/components/delonghi/delonghi.cpp

@@ -23,7 +23,7 @@ void DelonghiClimate::transmit_state() {
 
   data->mark(DELONGHI_HEADER_MARK);
   data->space(DELONGHI_HEADER_SPACE);
-  for (unsigned char b : remote_state) {
+  for (uint8_t b : remote_state) {
     for (uint8_t mask = 1; mask > 0; mask <<= 1) {  // iterate through bit mask
       data->mark(DELONGHI_BIT_MARK);
       bool bit = b & mask;

esphome/components/seeed_mr60fda2/seeed_mr60fda2.cpp

@@ -110,10 +110,10 @@ static uint8_t find_nearest_index(float value, const float *arr, int size) {
  * @param value The float value to convert.
  * @param bytes The byte array to store the converted value.
  */
-static void float_to_bytes(float value, unsigned char *bytes) {
+static void float_to_bytes(float value, uint8_t *bytes) {
   union {
     float float_value;
-    unsigned char byte_array[4];
+    uint8_t byte_array[4];
   } u;
 
   u.float_value = value;
@@ -128,7 +128,7 @@ static void float_to_bytes(float value, unsigned char *bytes) {
  * @param value The 32-bit unsigned integer to convert.
  * @param bytes The byte array to store the converted value.
  */
-static void int_to_bytes(uint32_t value, unsigned char *bytes) {
+static void int_to_bytes(uint32_t value, uint8_t *bytes) {
   bytes[0] = value & 0xFF;
   bytes[1] = (value >> 8) & 0xFF;
   bytes[2] = (value >> 16) & 0xFF;

esphome/components/tm1638/sevenseg.h

@@ -4,7 +4,7 @@ namespace esphome {
 namespace tm1638 {
 namespace TM1638Translation {
 
-const unsigned char SEVEN_SEG[] PROGMEM = {
+const uint8_t SEVEN_SEG[] PROGMEM = {
     0x00, /* (space) */
     0x86, /* ! */
     0x22, /* " */