devel/py-buildbot: Fix dependency after e3f7785e179478fad28f60841e34cde0f95e27f4

• Bump PORTREVISION for dependency change

make test results:

• sqlalchemy12: FAILED (skips=121, failures=4, errors=141, successes=728)
• sqlalchemy14: FAILED (skips=14, errors=46, successes=690)