Bump astroid to 2.15.8, update changelog
diff --git a/ChangeLog b/ChangeLog
index a2fbf85..89e2fc5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,12 +4,7 @@
What's New in astroid 2.15.8?
=============================
-Release date: TBA
-
-
-What's New in astroid 2.15.8?
-=============================
-Release date: TBA
+Release date: 2023-09-26
* Fix a regression in 2.15.7 for ``unsubscriptable-object``.
diff --git a/astroid/__pkginfo__.py b/astroid/__pkginfo__.py
index 9244a94..7d48031 100644
--- a/astroid/__pkginfo__.py
+++ b/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__ = "2.15.7"
+__version__ = "2.15.8"
version = __version__
diff --git a/tbump.toml b/tbump.toml
index fd1ad18..e724658 100644
--- a/tbump.toml
+++ b/tbump.toml
@@ -1,7 +1,7 @@
github_url = "https://github.com/PyCQA/astroid"
[version]
-current = "2.15.7"
+current = "2.15.8"
regex = '''
^(?P<major>0|[1-9]\d*)
\.