fix: change _pip to pass cmd then PIP_OPTS

mentioned in commit de0ee715

mentioned in merge request Orange-OpenSource/lfn/ci_cd/chained-ci-py!352 (merged)

mentioned in merge request Orange-OpenSource/k8s-tz/tools/glauth-config-generator!321 (merged)

mentioned in merge request Orange-OpenSource/k8s-tz/tools/kube-score-lint!359 (merged)

mentioned in merge request Orange-OpenSource/k8s-tz/tools/flux-bumpversion!361 (merged)

mentioned in merge request euri10/yatg!96

mentioned in merge request Orange-OpenSource/k8s-tz/tools/glauth-config-generator!345 (merged)

mentioned in merge request Orange-OpenSource/k8s-tz/tools/kube-score-lint!371 (merged)

mentioned in merge request Orange-OpenSource/lfn/ci_cd/chained-ci-py!357 (merged)

mentioned in merge request Orange-OpenSource/k8s-tz/tools/gitlab-tokens-manager!11 (merged)