Revision history for PostgreSQL extension tdigest.

1.4.5
    - Fix multiple memory-safety issues (OOB reads/writes, SIGSEGV crashes)
    - Fix multiple issues with float precision (NaN/infinity results)
    - Fix calculation of low/high thresholds in trimmed aggregates
    - Fix trimmed sum/avg aggregates to sort the centroids
    - Make sure processing does not generate digests with NaN/infinity float values
    - Make sure various int64 values do not overflow
    - Harden validation of function parameters to reject NULL/NaN/infinity values
    - Use overflow-resilient and/or numerically stable formulas in multiple functions
    - Improve test coverage by adding new regression tests
    - Speedup regression tests by using parallel schedule
    - Add tdigest_is_valid() to check validity of existing t-digest values
    - Mitigate incorrect alignment of t-digest values.

1.4.4
    - Add missing parts of automated release workflow.
    - Make regression tests pass on Postgres 19 branch
    - Fix various issues when parsing/validating input data
    - Fix combinning t-digests with different parameters

1.4.3
    - PGXN packaging (META etc.).
    - Automating releases to GitHub / PGXN