Upgrade to Git 2.26
What does this Merge Request do?
This updates doc/prepare.md to recommend using Git 2.26 as it is what we now use in GitLab.
This is a doc only change, so no need to add new tests.
Merge Request checklist
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This change is backward compatible. If not, please include steps to communicate to our users. -
Documentation added/updated, if needed.
Edited by Christian Couder