Bump elasticsearch from 7.6.0 to 7.7.0 (#13784)

Bumps [elasticsearch](https://github.com/elastic/elasticsearch-ruby) from 7.6.0 to 7.7.0.
- [Release notes](https://github.com/elastic/elasticsearch-ruby/releases)
- [Changelog](https://github.com/elastic/elasticsearch-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elastic/elasticsearch-ruby/compare/v7.6.0...7.7.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -201,13 +201,13 @@ GEM
       dotenv (= 2.7.5)
       railties (>= 3.2, < 6.1)
     e2mmap (0.1.0)
-    elasticsearch (7.6.0)
-      elasticsearch-api (= 7.6.0)
-      elasticsearch-transport (= 7.6.0)
-    elasticsearch-api (7.6.0)
+    elasticsearch (7.7.0)
+      elasticsearch-api (= 7.7.0)
+      elasticsearch-transport (= 7.7.0)
+    elasticsearch-api (7.7.0)
       multi_json
     elasticsearch-dsl (0.1.9)
-    elasticsearch-transport (7.6.0)
+    elasticsearch-transport (7.7.0)
       faraday (~> 1)
       multi_json
     encryptor (3.0.0)