ci: run sysbench against 2.10 branch
The '2.8' branch is no longer supported. So let's switch to '2.10'. NO_DOC=ci NO_TEST=ci NO_CHANGELOG=ci
The '2.8' branch is no longer supported. So let's switch to '2.10'. NO_DOC=ci NO_TEST=ci NO_CHANGELOG=ci
mentioned in commit 1acfc2fd