Update git submodules

Update git submodules

* Update swift from branch 'master'
  to 9059935f9f532031259f50410892f139331f24ad
  - Merge "sharder: use correct Timestamp formats"
  - sharder: use correct Timestamp formats

    Use Timestamp.internal for X-Timestamp header when making a PUT
    request to send shard range updates to the root container. The unit
    test already asserts that the internal format is sent, but the test
    failed to use a Timestamp where the internal and normal formats
    differed..

    Don't try to cast timestamp strings to floats when sorting
    CleavingContext metadata. Timestamp strings may have the form
    <float>_<offset> so it is safer to cast a Timestamp string to a
    Timestamp and then to cast the Timestamp to a float when necessary.

    Change-Id: I59e140d1226a4b0c2c8f37678bc2dc87d9ffa631
    Signed-off-by: Alistair Coles <alistairncoles@gmail.com>
    Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
    Signed-off-by: Matthew Oliver <matt@oliver.net.au>