Merge branch 'bump_sg_snapshot_version' into 'master'

Bump SG snapshot version.

See merge request search-guard/search-guard-kibana-plugin!740

package.json

@@ -5,7 +5,7 @@
   "homepage": "https://search-guard.com",
   "license": "Apache-2.0",
   "searchguard": {
-    "test_sg_version": "7.12.1-master-SNAPSHOT"
+    "test_sg_version": "7.13.1-51.0.0-SNAPSHOT"
   },
   "repository": {
     "type": "git",