Add 2.7 version PR (#3917)

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

_config.yml

@@ -5,9 +5,9 @@ baseurl: "/docs/latest" # the subpath of your site, e.g. /blog
 url: "https://opensearch.org" # the base hostname & protocol for your site, e.g. http://example.com
 permalink: /:path/
 
-opensearch_version: '2.6.0'
-opensearch_dashboards_version: '2.6.0'
-opensearch_major_minor_version: '2.6'
+opensearch_version: '2.7.0'
+opensearch_dashboards_version: '2.7.0'
+opensearch_major_minor_version: '2.7'
 lucene_version: '9_5_0'
 
 # Build settings

_data/versions.json

@@ -1,6 +1,7 @@
 {
-  "current": "2.6",
+  "current": "2.7",
   "all": [
+    "2.7",
     "2.6",
     "2.5",
     "2.4",
@@ -13,5 +14,5 @@
     "1.1",
     "1.0"
   ],
-  "latest": "2.6"
+  "latest": "2.7"
 }