fetchmail: upgrade 6.4.20 -> 6.4.21

* The new security fix in 6.4.20 for CVE-2021-36386 caused truncation of
  messages logged to buffered outputs, predominantly --logfile.

  This also caused lines in the logfile to run into one another because
  the fragment containing the '\n' line-end character was usually lost.

  Reason is that on all modern systems (with <stdarg.h> header and vsnprintf()
  interface), the length of log message fragments was added up twice, so
  that these ended too deep into a freshly allocated buffer, after the '\0'
  byte.  Unbuffered outputs flushed the fragments right away, which masked the
  bug.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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