fix(deps): update dependency mcp to v1.12.3

Author: renovate[bot]

pyproject.toml

@@ -67,7 +67,7 @@ requires-python = ">=3.11, <4.0"
 dependencies = [
     "pydantic>=2.11.0",
     "pydantic-settings>=2.8.1",
-    "mcp==1.3.0",
+    "mcp==1.12.3",
     "griffe>=1.7.0",
     "typer>=0.15.2",
     "atlassian-python-api>=4.0.0",