fix(deps): pin astroid 4.0.4 to satisfy pylint 4.0.6 constraint

pylint 4.0.6 requires astroid<=4.1.dev0,>=4.0.2, so astroid 4.1.2 caused a
ResolutionImpossible error. Downgrade to 4.0.4 (latest 4.0.x) to fix CI.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jingjingjia-ms

requirements-dev.txt

@@ -1,7 +1,7 @@
 aiohttp==3.14.1
 aiosignal==1.4.0
 anyio==4.13.0
-astroid==4.1.2
+astroid==4.0.4
 async-timeout==5.0.1
 attrs==26.1.0
 azure-core==1.41.0