logwatch: Update to 7.5.5

For details see:
https://build.opensuse.org/package/view_file/server:monitoring/logwatch/ChangeLog?expand=1

Plus: deleted no longer need dhcpd-patch.

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/patches/logwatch/logwatch-7.5.4-dhcpd_reuse_lease_entries.patch

@@ -1,15 +0,0 @@
-diff --git a/scripts/services/dhcpd b/scripts/services/dhcpd
-index 87312f7..bb5cd4c 100644
---- a/scripts/services/dhcpd
-+++ b/scripts/services/dhcpd
-@@ -79,7 +79,9 @@ while (my $line = <STDIN>) {
-       ($line =~ /^Solicit message from/) or
-       ($line =~ /^Sending Advertise to/) or
-       ($line =~ /^pool [0-9a-f]+ /) or
--      ($line =~ /^[^ ]* file: /)
-+      ($line =~ /^[^ ]* file: /) or
-+      ($line =~ /^reuse_lease: lease age \d+ \(secs\) under \d+\% threshold, reply with unaltered, existing lease for/) or
-+      0 # noop, but makes diffs easier when appending ignore statements
-       ) {
-       # Ignore these lines
-    } elsif ($line =~ s/Listening on\s+//) {