fix(release): make deployment backup and rollback immutable

backend/tests/test_readiness_gate.py

@@ -1,11 +1,12 @@
 from pathlib import Path
 
 
-def test_backend_keeps_starlette_on_the_supported_pre_httpx2_line() -> None:
+def test_backend_uses_patched_starlette_and_explicit_httpx2_test_client() -> None:
     pyproject = Path(__file__).resolve().parents[1] / "pyproject.toml"
     content = pyproject.read_text(encoding="utf-8")
 
-    assert '"starlette>=0.46.0,<1.0.0"' in content
+    assert '"starlette>=1.3.1,<2.0.0"' in content
+    assert '"httpx2>=2.0.0"' in content
 
 
 def test_readiness_gate_treats_deprecation_warnings_as_errors() -> None: