fix: adapt variant tests (#87)

Author: Hofer-Julian

tests/data/pixi_build/minimal-backend-workspaces/pixi-build-cmake/pixi.lock

@@ -25,7 +25,7 @@ def test_pixi_minimal_backend(pixi_project: Path, pixi: Path, tmp_pixi_workspace
 
     # Install the environment
     verify_cli_command(
-        [pixi, "run", "-v", "--locked", "--manifest-path", manifest, "start"],
+        [pixi, "run", "-v", "--manifest-path", manifest, "start"],
         stdout_contains="Build backend works",
     )