[DOCS] Updates 8.11.1 release notes

Author: picandocodigo

Diff for: CHANGELOG.md

@@ -1,5 +1,13 @@
 *To see release notes for the `7.x` branch and older releases, see [CHANGELOG on the 7.17 branch](https://github.com/elastic/elasticsearch-ruby/blob/7.17/CHANGELOG.md).*
 
+## 8.11.1 Release notes
+
+Adds `base64` dependency
+
+base64 was added to the gemspec, since starting in Ruby 3.4.0, base64 will no longer be part of the default gems and will no longer be in the standard library.
+
+base64 is used forAPI key and Cloud ID. The dependency used to be declared in transport, but it's not needed there since the implementation using it is in this codebase.
+
 ## 8.11.0 Release notes
 
 ### Client

Diff for: docs/release_notes/811.asciidoc

@@ -1,6 +1,17 @@
 [[release_notes_8110]]
 === 8.11 Release notes
 
+[discrete]
+[[release_notes_8_11_1]]
+=== 8.11.1 Release notes
+
+Adds `base64` dependency
+
+base64 was added to the gemspec, since starting in Ruby 3.4.0, base64 will no longer be part of the default gems and will no longer be in the standard library.
+
+base64 is used forAPI key and Cloud ID. The dependency used to be declared in transport, but it's not needed there since the implementation using it is in this codebase.
+
+
 [discrete]
 [[release_notes_811_0]]
 === 8.11.0 Release notes