package/fetchmail: security bump to version 6.4.22

Fixes the following security issues:

- CVE-2021-39272: Fetchmail before 6.4.22 fails to enforce STARTTLS session
  encryption in some circumstances, such as a certain situation with IMAP
  and PREAUTH.
  https://www.fetchmail.info/fetchmail-SA-2021-02.txt

Update COPYING hash for a clarification of the license situation with
openssl 3.x (which is Apache 2.0 licensed):

https://gitlab.com/fetchmail/fetchmail/-/commit/8eed56c21ca5bbdf3c00aaf74d807bcad8713ba9

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/fetchmail/fetchmail.hash

@@ -1,6 +1,4 @@
-# From https://sourceforge.net/p/fetchmail/mailman/message/37327392/
-sha256  6a459c1cafd7a1daa5cd137140da60c18c84b5699cd8e7249a79c33342c99d1d  fetchmail-6.4.21.tar.xz
-# From https://sourceforge.net/projects/fetchmail/files/branch_6.4/
-sha1  a264c50256c2b42d2c7893f9efae7c9a29350786  fetchmail-6.4.21.tar.xz
+# From https://sourceforge.net/p/fetchmail/mailman/message/37350119/
+sha256  cc6818bd59435602169fa292d6d163d56b21c7f53112829470a3aceabe612c84  fetchmail-6.4.22.tar.xz
 # Locally computed:
-sha256  6346b5aa04e258fa4326272ea92372d796b4382aa963535ae98a3bb5f8cd5aeb  COPYING
+sha256  001d1b8d111a83e3bab8b4d511ea4767d37d3bd0583560fccece630df1ba8f3c  COPYING

package/fetchmail/fetchmail.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 FETCHMAIL_VERSION_MAJOR = 6.4
-FETCHMAIL_VERSION = $(FETCHMAIL_VERSION_MAJOR).21
+FETCHMAIL_VERSION = $(FETCHMAIL_VERSION_MAJOR).22
 FETCHMAIL_SOURCE = fetchmail-$(FETCHMAIL_VERSION).tar.xz
 FETCHMAIL_SITE = http://downloads.sourceforge.net/project/fetchmail/branch_$(FETCHMAIL_VERSION_MAJOR)
 FETCHMAIL_LICENSE = GPL-2.0; some exceptions are mentioned in COPYING