libstdc++: Update tzdata to 2026b
Updates the libstdc++ timezone database to the 2026b release.
This commit updates the timezone database used by libstdc++ to the latest 2026b release. This ensures that programs using the library have access to the most up-to-date information about timezone rules and historical changes, preventing incorrect time conversions and calculations. This is important for applications that need to handle dates and times across different timezones accurately.
In Details
libstdc++ uses the tzdata database (also known as the IANA timezone database) to handle timezone conversions. The tzdata.zi file contains the compiled data. This commit updates the file to the 2026b release, incorporating changes to timezone rules and historical data.
For Context
Timezone databases are collections of data representing the history of local time for many representative locations around the globe. These databases are essential for accurately converting times between different timezones and for handling historical dates and times. libstdc++ uses this data to implement its timezone-related functionalities. Keeping the database up-to-date ensures accurate time conversions.