package/sysstat: update upstream location

The http://pagesperso-orange.fr service being down,
http://pagesperso-orange.fr/sebastien.godard/ is no longer
accessible (or more precisely serves some HTML junk), meaning that we
currently cannot download the tarball of sysstat from the official
upstream location, and we always fallback to sources.buildroot.net.

This commit therefore updates to use the new upstream location on
github.io. The 12.6.1 release is available there, with the same hash,
so we can just point to the new upstream location.

Fixes:

ERROR: while checking hashes from package/sysstat//sysstat.hash
ERROR: sysstat-12.6.1.tar.xz has wrong sha1 hash:
ERROR: expected: a730982e0c2d4964a0022c1509f3ea0a345402bc
ERROR: got     : d64a079729f2ff5b304294d68fbc041a46c4966d
ERROR: Incomplete download, or man-in-the-middle (MITM) attack

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 35a2cb02277acae94f018a0d22138dc9de005fdf)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/sysstat/Config.in

@@ -36,4 +36,4 @@ config BR2_PACKAGE_SYSSTAT
 	   * TTY device activity
 	   * Power management statistics
 
-	  http://pagesperso-orange.fr/sebastien.godard/
+	  https://sysstat.github.io/

package/sysstat/sysstat.mk

@@ -6,7 +6,7 @@
 
 SYSSTAT_VERSION = 12.6.1
 SYSSTAT_SOURCE = sysstat-$(SYSSTAT_VERSION).tar.xz
-SYSSTAT_SITE = http://pagesperso-orange.fr/sebastien.godard
+SYSSTAT_SITE = https://sysstat.github.io/sysstat-packages
 SYSSTAT_CONF_OPTS = --disable-file-attr
 SYSSTAT_DEPENDENCIES = host-gettext $(TARGET_NLS_DEPENDENCIES)
 SYSSTAT_LICENSE = GPL-2.0+