package/avrdude: bump to version 8.1

Release notes:
https://github.com/avrdudes/avrdude/blob/v8.1/NEWS

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/avrdude/avrdude.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  a689d70a826e2aa91538342c46c77be1987ba5feb9f7dab2606b8dae5d2a52d5  avrdude-8.0.tar.gz
+sha256  2d3016edd5281ea09627c20b865e605d4f5354fe98f269ce20522a5b910ab399  avrdude-8.1.tar.gz
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/avrdude/avrdude.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-AVRDUDE_VERSION = 8.0
+AVRDUDE_VERSION = 8.1
 AVRDUDE_SITE = $(call github,avrdudes,avrdude,v$(AVRDUDE_VERSION))
 AVRDUDE_LICENSE = GPL-2.0+
 AVRDUDE_LICENSE_FILES = COPYING