Bump astroid to 3.0.0a9, update changelog
diff --git a/astroid/__pkginfo__.py b/astroid/__pkginfo__.py
index f8b8ebb..a4556dc 100644
--- a/astroid/__pkginfo__.py
+++ b/astroid/__pkginfo__.py
@@ -2,5 +2,5 @@
 # For details: https://github.com/pylint-dev/astroid/blob/main/LICENSE
 # Copyright (c) https://github.com/pylint-dev/astroid/blob/main/CONTRIBUTORS.txt
 
-__version__ = "3.0.0a9-dev0"
+__version__ = "3.0.0a9"
 version = __version__
diff --git a/script/.contributors_aliases.json b/script/.contributors_aliases.json
index fedcc68..73e9e0d 100644
--- a/script/.contributors_aliases.json
+++ b/script/.contributors_aliases.json
@@ -30,6 +30,10 @@
     "mails": ["androwiiid@gmail.com"],
     "name": "Paligot Gérard"
   },
+  "antonio@zoftko.com": {
+    "mails": ["antonio@zoftko.com", "antonioglez-23@hotmail.com"],
+    "name": "Antonio"
+  },
   "areveny@protonmail.com": {
     "mails": ["areveny@protonmail.com", "self@areveny.com"],
     "name": "Areveny",
diff --git a/tbump.toml b/tbump.toml
index d5e2b5d..d1508fa 100644
--- a/tbump.toml
+++ b/tbump.toml
@@ -1,7 +1,7 @@
 github_url = "https://github.com/pylint-dev/astroid"
 
 [version]
-current = "3.0.0a9-dev0"
+current = "3.0.0a9"
 regex = '''
 ^(?P<major>0|[1-9]\d*)
 \.