Update to 1.3.8a
    
    - New upstream release 1.3.8a
      - Fix mod_sftp failure to handle SFTP requests to truncate files to zero size
        (GH#1581)
      - Fix mod_sftp improperly handling SFTP WRITE requests for files opened for
        appending (GH#1584)
      - Build-time detection of Linux POSIX ACL support was broken since 1.3.8rc2
        (GH#1568)
      - Fix failure to load mod_rewrite as a dynamic module due to
        incomplete/missing library linker flags (GH#1590)
      - <Class> section is allowed to be in <Global>, but From directive is not
        (GH#1597)
      - ExtendedLog SSH, SFTP classes not working as expected (GH#1617)
      - Fix mod_sftp not handling multiple concurrent open file handles/transfers
        well for logging (GH#1646)
      - "TLSRequired off" plus Protocols directive caused mod_tls to terminate the
        session abruptly (GH#1679)
      - Fix mod_tls failure to compile against OpenSSL 3.0.8 due to missing
        ENGINE_METHOD_ flags (GH#1689)
      - Unknown named connection error when using different SQL backends (GH#1659)
      - Fix mod_sql not properly closing all named backend connections on session
        exit (GH#1697)
      - SSH key exchanges failed unexpectedly with "unable to write X bytes of raw
        data" errors due to small ProFTPD buffer (GH#1694)
      - Fix high session memory usage caused by SFTP outgoing data buffering
        (GH#1678)
      - Out-of-bounds buffer read when handling FTP commands (GH#1683)
      - SFTP algorithm settings in <Global> section were not being used (GH#1712)