ci: gir-checks: Update submodules before running jobs
This might explain the weird diff we were seeing in submodule hashes.
All other jobs checking git diff after their operations make sure
they're up-to-date, except the gir-checks step.
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This might explain the weird diff we were seeing in submodule hashes.
All other jobs checking git diff after their operations make sure
they're up-to-date, except the gir-checks step.