When switching from `master` to `main` as default branch, it was
forgotten to change the `defaultbranch` value in `.gitreview` as
well.

Resolves: #97843
Releases: main
Change-Id: I84d011f86d0f165eeb9eccce757bb7fc32f54924
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75014


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>

git-review is a tool that helps submitting git branches to gerrit for
review. Provide a default configuration for the TYPO3 gerrit to ease
setup.

Resolves: #72768
Releases: master
Change-Id: I37ba4fe7f5723f7f4d3a7b6b9a3961016ac37f25
Reviewed-on: https://review.typo3.org/46014


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>