docs: Add release notes for 2.11.1.post2 (#5931)

Hi @triklozoid!

This PR was created in response to a manual trigger of the OnPrem
release 2.11.1.post2 workflow.

---------

Co-authored-by: robot-ci-heartex <robot-ci-heartex@users.noreply.github.com>
Co-authored-by: Caitlin Wheeless <caitlin.wheeless@gmail.com>

docs/source/guide/release_notes/onprem/2.11.1.post2.md

@@ -0,0 +1,15 @@
+---
+hide_sidebar: true
+---
+
+## Label Studio Enterprise 2.11.1.post2
+
+<div class="onprem-highlight">Bug fix</div>
+
+*May 30, 2024*
+
+Helm Chart version: 1.4.8
+
+### Bug fixes
+- Fix Redis connection with SSL.
+