Bump Pekko to 1.0.3

Bump Pekko to 1.0.3

https://github.com/apache/pekko/releases/tag/v1.0.3
https://github.com/apache/pekko/blob/main/docs/src/main/paradox/release-notes/releases-1.0.md

The most important change is the ability to run Akka and Pekko
clusters together:
https://cwiki.apache.org/confluence/display/PEKKO/Pekko+Akka+Compatibility

There is no need to update asn, agrona, aeron, ssl-config and config
versions because they are the same like in 1.0.2:
https://github.com/apache/pekko/blob/main/project/Dependencies.scala

JIRA: CONTROLLER-2120
Change-Id: Id99162dd2795685ffbeeaa1f014d8bf58549d9ff
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>
Signed-off-by: Yaroslav Lastivka <yaroslav.lastivka@pantheon.tech>