devel/py-oci: update to 2.26.0

Changelogs:
https://github.com/oracle/oci-python-sdk/releases/tag/v2.26.0
https://github.com/oracle/oci-python-sdk/releases/tag/v2.25.0

PR: 251896
Submitted by: Alessandro Sagratini <ale_sagra@hotmail.com> (maintainer)
Approved by: arrowd, tcberner (mentors, implicit)