Bump dependencies to newer Sodium SR2 dev versions

Bump dependencies to newer Sodium SR2 dev versions

org.opendaylight.odlparent  *                   5.0.3 -> 5.0.4
org.opendaylight.yangtools  yangtools-artifacts 3.0.6 -> 3.0.7
org.opendaylight.mdsal      binding-parent      4.0.7 -> 4.0.8
org.opendaylight.mdsal      mdsal-artifacts     4.0.7 -> 4.0.8

https://docs.opendaylight.org/projects/integration-distribution/en/stable-sodium/platform-versions.html

Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: I4e22d0e9310dbdf4107fb57a1a73b6bb83b38cb5