Update git submodules

* Update src/sonic-sairedis from branch 'buzznik_dev'
  to 4cd4dfc8bca79343277a68a502ada0f6b6ee15ce
  - [build] Pull in two commits from master that shorten libsairedis build time.
    
    This is the 1st commit message (5c98f57):
    
    [debian]: Change build order in target binary (sonic-net#452)
    
    Make binary-syncd the last target, so the non-rpc requisites will be available after the first build
    It will allow doing incremental builds later on for the main binary type
    
    This is the 2nd commit message (e10fba8):
    
    [debian] increment debian compatibility to 10 to enable parallel package build (sonic-net#461)
    
    * fix parallel build
    
    Signed-off-by: Stepan Blyschak <stepanb@mellanox.com>
    
    * [debian] increment debian compatibility to 10 to enable parallel package
    build
    
    From debhelper man pages:
    
    "If neither option is specified, debhelper currently defaults to
    --parallel in compat 10 (or later) and --no-parallel otherwise."
    
    Signed-off-by: Stepan Blyschak <stepanb@mellanox.com>
    
    * make tests run serial
    
    Signed-off-by: Stepan Blyschak <stepanb@mellanox.com>
    
    Change-Id: If3ec2369e13041ed506090d23eb2a5f3b2775d84