This is Beeper's custom version of synapse, we rebase roughly 25 commits on top of each upstream release with a few Beeper specific modifications. We also have an actual Synapse fork here: beeper/synapse-fork which is where we make changes we expect to merge into upstream.
Here we're upgrading to v1.96.1:
# Make a new branch from the upstream release, we do this so we can create a PR
# of Beeper -> upstream to run tests/confirm we're happy.
git checkout -f v1.96.1
git checkout -b upstream-1.96.1
git push -u beeper upstream-1.96.1
# Check out the base branch, pull any changes
git checkout beeper
git pull
# Now create a new branch to rebase
git checkout -b beeper-1.96.1
# And do the rebase
git rebase v1.96.1
# fix any conflicts...
# Push and make a PR from this branch to the upstream one created above
git push -u beeper beeper-1.96.1
Once it's ready we just overwrite the beeper branch with the new one:
git checkout beeper-1.96.1
git push --force beeper beeper