Bump astroid to 2.15.6, update changelog

Author: Pierre-Sassoulas

ChangeLog

@@ -12,16 +12,15 @@ Release date: TBA
 
   Refs #2204
 
-
-What's New in astroid 2.15.6?
+What's New in astroid 2.15.7?
 =============================
 Release date: TBA
 
 
 
 What's New in astroid 2.15.6?
 =============================
-Release date: 2023-05-14
+Release date: 2023-07-08
 
 * Harden ``get_module_part()`` against ``"."``.
 

astroid/__pkginfo__.py

@@ -2,5 +2,5 @@
 # For details: https://github.com/PyCQA/astroid/blob/main/LICENSE
 # Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
 
-__version__ = "2.15.5"
+__version__ = "2.15.6"
 version = __version__

tbump.toml

@@ -1,7 +1,7 @@
 github_url = "https://github.com/PyCQA/astroid"
 
 [version]
-current = "2.15.5"
+current = "2.15.6"
 regex = '''
 ^(?P<major>0|[1-9]\d*)
 \.