test: align impeccable exact-pin guards with 3.6.0 bump

The dependabot bump only touches package.json/package-lock.json; the
version-provenance guards assert the pinned version in three places the
bump cannot reach. Bump them to 3.6.0 so the PR's CI can go green.

Author: jomie

tests/test_dashboard_vendor_assets.py

@@ -43,5 +43,5 @@ def test_design_linter_dependency_is_exactly_pinned():
     package = json.loads((ROOT / "package.json").read_text(encoding="utf-8"))
     package_lock = json.loads((ROOT / "package-lock.json").read_text(encoding="utf-8"))
     version = package["devDependencies"]["impeccable"]
-    assert version == "3.5.0"
+    assert version == "3.6.0"
     assert package_lock["packages"]["node_modules/impeccable"]["version"] == version

tests/test_release_infrastructure.py

@@ -63,9 +63,9 @@ def test_dependency_automation_covers_every_root_ecosystem():
     )
     package = json.loads(_text("package.json"))
     lock = json.loads(_text("package-lock.json"))
-    assert package["devDependencies"]["impeccable"] == "3.5.0"
-    assert lock["packages"][""]["devDependencies"]["impeccable"] == "3.5.0"
-    assert lock["packages"]["node_modules/impeccable"]["version"] == "3.5.0"
+    assert package["devDependencies"]["impeccable"] == "3.6.0"
+    assert lock["packages"][""]["devDependencies"]["impeccable"] == "3.6.0"
+    assert lock["packages"]["node_modules/impeccable"]["version"] == "3.6.0"
 
 
 def test_playwright_server_never_opens_the_developers_configured_database():