pytest: update to work with recent Python

With Python 3.14, the required pytest version stopped working due to
breaking changes in AST.

This patch changes the test tool versions to the most recent one, by
requiring only the minimal version, but not setting a specific one.
Recent pytest version also requires that the search path for Python
modules is defined.

Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>

pytest.ini

@@ -4,3 +4,4 @@ junit_family = xunit1
 markers=
     source_order: mark test as order bound
     playbook: playbook tests
+pythonpath = tests

requirements-tests.txt

@@ -1,8 +1,8 @@
 -r requirements.txt
-pytest==7.1.3
-pytest-sourceorder==0.6.0
+pytest
+pytest-sourceorder
 pytest-split>=0.8.0
 pytest-custom_exit_code>=0.3.0
-pytest-testinfra==6.8.0
-pytest-randomly==3.12.0
+pytest-testinfra
+pytest-randomly
 pyyaml>=3