Update git submodules
* Update oslo.serialization from branch 'master' to a0f68b3d8537b7a36cc69f938ea8e902086bb0e2 - Merge "reno: Update master for unmaintained/xena" - reno: Update master for unmaintained/xena Update the xena release notes configuration to build from unmaintained/xena. Change-Id: I1045375de2a0bdc613ccf1ab89eba959aa2d2d95
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