add back the roundcube patch

debian/patches/roundcube.diff

@@ -0,0 +1,11 @@
+--- fail2ban-0.11.1.orig/config/filter.d/roundcube-auth.conf
++++ fail2ban-0.11.1/config/filter.d/roundcube-auth.conf
+@@ -18,7 +18,7 @@ prefregex = ^\s*(\[\])?(%(__hostname)s\s
+ failregex = ^(?:FAILED login|Login failed) for <F-USER>.*</F-USER> from <HOST>(?:(?:\([^\)]*\))?\. (?:(?! from ).)*(?: user=(?P=user))? in \S+\.php on line \d+ \(\S+ \S+\))?$
+             ^(?:<[\w]+> )?Failed login for <F-USER>.*</F-USER> from <HOST> in session \w+( \(error: \d\))?$
+ 
+-ignoreregex = 
++ignoreregex = Could not connect to .* Connection refused
+ 
+ journalmatch = SYSLOG_IDENTIFIER=roundcube
+ 

debian/patches/series

@@ -6,3 +6,4 @@ deb_no_iptables_service
 python3-test-suite.diff
 no-python-user.diff
 python-3.9.patch
+roundcube.diff