Update git submodules
* Update charm-swift-storage from branch 'master'
- Merge "Ensure lockup_timeout is never < 2*rsync_timeout"
- Ensure lockup_timeout is never < 2*rsync_timeout
Change-Id: Id0afc210b7be8ac7c740753ef06b51db0bae410c
Closes-Bug: 1888725
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