Revert the use of astroid 2.4 until 2.4 itself is released

Author: PCManticore

pylint/__pkginfo__.py

@@ -36,7 +36,7 @@
     version += "-dev" + str(dev_version)
 
 install_requires = [
-    "astroid>=2.4.0,<=2.5",
+    "astroid>=2.3.0,<=2.5",
     "isort>=4.2.5,<5",
     "mccabe>=0.6,<0.7",
     "toml>=0.7.1",