Fix calling proper Python interpreter

[phracek]

Fix calling proper Python interpreter.

This commit also fixes Python interpreter for OpenShift Pytest suite

[phracek]

[test-pytest][test-openshift-pytest]

[github-actions]

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[github-actions]

Testing Farm results

name	compose	arch	status	started (UTC)	time	logs
RHEL9 - PyTest - 7	RHEL-9.6.0-Nightly	x86_64	✅ passed	26.02.2026 08:46:57	15min 26s	test pipeline
Fedora - PyTest - 7	Fedora-latest	x86_64	✅ passed	26.02.2026 08:52:22	5min 57s	test pipeline
RHEL8 - PyTest - 6	RHEL-8.10.0-Nightly	x86_64	✅ passed	26.02.2026 08:34:23	14min 39s	test pipeline
CentOS Stream 9 - PyTest - 7	CentOS-Stream-9	x86_64	✅ passed	26.02.2026 08:45:37	8min 56s	test pipeline
RHEL9 - Unsubscribed host - PyTest - 7	RHEL-9.6.0-Nightly	x86_64	✅ passed	26.02.2026 08:41:49	14min 7s	test pipeline
RHEL8 - PyTest - OpenShift 4 - 6	RHEL-8.10.0-Nightly	x86_64	✅ passed	26.02.2026 08:58:03	16min 9s	test pipeline
RHEL9 - PyTest - OpenShift 4 - 7	RHEL-9.6.0-Nightly	x86_64	✅ passed	26.02.2026 08:56:31	23min 6s	test pipeline

[phracek]

[test-pytest][test-openshift-pytest]