getEpoch has a race condition causing it to be off by one day

[ant32]

Ran into an issue where the epoch time was off by exactly one day. This is caused by getEpoch function first reading date and then reading time. Date time may have rolled over to new day in between.

STM32RTC/src/STM32RTC.cpp

Line 1110 in a3036e0

syncTime();

time_t STM32RTC::getEpoch(uint32_t *subSeconds)
{
  struct tm tm;

  syncDate();
  syncTime(); // <-- date may have changed and time sometimes reads 00:00:00 of the following date.

Discussion here
https://github.com/orgs/stm32duino/discussions/2600#discussioncomment-11545824