package/openlayers: bump to version 6.8.1

Signed-off-by: Thomas Claveirole <thomas.claveirole@green-communications.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/openlayers/openlayers.hash

@@ -1,2 +1,2 @@
 # Locally computed:
-sha256	c8695a15c3570ca0c8f84c79391f81a89b925a5fcca28dc5cd60942c0dade247	v6.6.1-dist.zip
+sha256	07d06f17f44399d86ddeac8d8000d39ff9db503257f77c59e5743d5934463623	v6.8.1-dist.zip

package/openlayers/openlayers.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-OPENLAYERS_VERSION = 6.6.1
+OPENLAYERS_VERSION = 6.8.1
 OPENLAYERS_SOURCE = v$(OPENLAYERS_VERSION)-dist.zip
 OPENLAYERS_SITE = https://github.com/openlayers/openlayers/releases/download/v$(OPENLAYERS_VERSION)
 OPENLAYERS_LICENSE = BSD-2-Clause