Updated keep-alive defaults

app/src/main/res/xml/providers.xml

@@ -159,7 +159,7 @@
     <provider
         name="gmx.com"
         domain="gmx\\.com,gmx\\.us"
-        keepalive="9"
+        keepalive="12"
         link="https://support.gmx.com/pop-imap/imap/index.html#breadcrumb_help_pop-imap_imap_server">
         <imap
             host="imap.gmx.com"
@@ -191,7 +191,7 @@
     <provider
         name="gmx.de"
         domain="gmx\\.de,gmx\\.net,mein\\.gmx,gmx\\.at,gmx\\.ch,mail\\.gmx,email\\.gmx,gmx\\.eu,gmx\\.org,gmx\\.info,gmx\\.biz"
-        keepalive="9"
+        keepalive="12"
         link="https://hilfe.gmx.net/pop-imap/imap/imap-serverdaten.html#indexlink_help_pop-imap_imap">
         <imap
             host="imap.gmx.net"
@@ -248,7 +248,7 @@
     </provider>
     <provider
         name="web.de"
-        keepalive="9"
+        keepalive="12"
         link="https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html"
         user="local">
         <imap
@@ -289,7 +289,7 @@
     <provider
         name="Ionos (1und1)"
         domain="ionos\\.de,ionos\\.com,online\\.de"
-        keepalive="9"
+        keepalive="12"
         link="https://www.ionos.de/hilfe/e-mail/allgemeine-themen/einstellungen-fuer-ihr-e-mail-programm/">
         <imap
             host="imap.ionos.de"