logrotate: Update to 3.21.0

logrotate: Update to 3.21.0

For details see:
https://github.com/logrotate/logrotate/releases/tag/3.21.0

"add ignoreduplicates directive to allow duplicate file matches (#473)
add --wait-for-state-lock option to wait for lock on the state file (#457)
avoid failure when an anonymous non-privileged user runs logrotate (#463)
support home dir expansion in olddir (#454)
reduce unnecessary rename operations with start N where N > 1 (#450)
unify handling of log levels (#239 #449)
do not print error: when exit code is unaffected (#448)"

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>