package/flot: update hash

Upstream apparently updated their tarball
http://thread.gmane.org/gmane.comp.lib.uclibc.buildroot/122226/focus=138335

Issue reported upstream: https://github.com/flot/flot/issues/1484

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/flot/flot.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256	d6bddb781ce8ab8bba82c535a0767c22e606cabd9dbb484027b8ff375a193952	flot-0.8.3.tar.gz
+sha256	ef9a873befe3ff5ea42ebf1c3657887265a1717744ca8ed0c2bd3dd736d16b21	flot-0.8.3.tar.gz