[clang-tidy] Concatenate nested namespaces (1/7: components a-c) (#16294)

esphome/components/bme280_i2c/bme280_i2c.cpp

@@ -5,8 +5,7 @@
 #include "esphome/components/i2c/i2c.h"
 #include "../bme280_base/bme280_base.h"
 
-namespace esphome {
-namespace bme280_i2c {
+namespace esphome::bme280_i2c {
 
 bool BME280I2CComponent::read_byte(uint8_t a_register, uint8_t *data) {
   return I2CDevice::read_byte(a_register, data);
@@ -26,5 +25,4 @@ void BME280I2CComponent::dump_config() {
   BME280Component::dump_config();
 }
 
-}  // namespace bme280_i2c
-}  // namespace esphome
+}  // namespace esphome::bme280_i2c