Prepare for 13.8.0 release (#1443)

* Prepare for 13.8.0 release

Signed-off-by: Nate Koenig <natekoenig@gmail.com>

---------

Signed-off-by: Nate Koenig <natekoenig@gmail.com>

Author: nkoenig

CMakeLists.txt

@@ -5,7 +5,7 @@ if(COMMAND CMAKE_POLICY)
   CMAKE_POLICY(SET CMP0004 NEW)
 endif(COMMAND CMAKE_POLICY)
 
-project (sdformat13 VERSION 13.7.0)
+project (sdformat13 VERSION 13.8.0)
 
 # The protocol version has nothing to do with the package version.
 # It represents the current version of SDFormat implemented by the software

Changelog.md

@@ -1,5 +1,13 @@
 ## libsdformat 13.X
 
+### libsdformat 13.8.0 (2024-06-25)
+
+1. Added `World::ActorByName`
+    * [Pull request #1436](https://github.com/gazebosim/sdformat/pull/1436)
+
+1. Backport #1367 to Garden: Fix find Python3 logic.
+    * [Pull request #1370](https://github.com/gazebosim/sdformat/pull/1370)
+
 ### libsdformat 13.7.0 (2024-06-13)
 
 1. Add support for no gravity link