ovs: Bump submodule to latest OVS branch-3.0.

This picks up the following relevant OVS changes:
  876584141 vconn: Always properly free flow stats reply.
  2d60ee374 ovsdb-idl: Fix IDL memory leak.
  4198bcdfb compiler: Fix errors in Clang 17 ubsan checks.
  ec048ab62 vlog: Destroy async_append first then close log_fd.
  dbaf7271c hash, jhash: Fix unaligned access to the hash remainder.
  85285fb45 ovs-atomic: Fix inclusion of Clang header by GCC 14.
  e040f35b2 vconn: Count vconn_sent regardless of log level.
  ... and others.

Reported-at: https://mail.openvswitch.org/pipermail/ovs-dev/2024-October/417627.html
Signed-off-by: Vladislav Odintsov <[email protected]>