Add 3.1.1 release (#4404)

Author: p7nov

doc/release/3.1.0.rst

@@ -3,7 +3,7 @@ Tarantool 3.1
 
 Release date: April 16, 2024
 
-Releases on GitHub: :tarantool-release:`3.1.0`
+Releases on GitHub: :tarantool-release:`3.1.1`, :tarantool-release:`3.1.0`
 
 The 3.1 release of Tarantool continues the development of a new cluster configuration approach introduced in the :ref:`3.0 version <3-0-new_declarative_configuration>` and adds the following main product features and improvements for the Community and Enterprise editions:
 

doc/release/_images/releases_calendar.svg

@@ -65,7 +65,8 @@ For information about earlier versions, see :doc:`eol_versions`.
             -   **April 16, 2024**
             -   **April 16, 2026**
             -   **Not planned yet**
-            -   | :tarantool-release:`3.1.0`
+            -   | :tarantool-release:`3.1.1`
+                | :tarantool-release:`3.1.0`
 
         *   -   :doc:`3.0 </release/3.0.0>`
             -   **December 26, 2023**