Utilize flatten-maven-plugin to allow debezium-server-iceberg to be used as a maven dependency

[matthewmcnew]

When attempting to use io.debezium.debezium-server-iceberg-sink

ERROR] Failed to execute goal on project tigerlake-sink: Could not collect dependencies for project com.timescale:tigerlake-sink:jar:0.0.1-SNAPSHOT
[ERROR] Failed to read artifact descriptor for io.debezium:debezium-server-iceberg-sink:jar:latest
[ERROR]         Caused by: The following artifacts could not be resolved: io.debezium:debezium-server-iceberg:pom:${revision} (absent): io.debezium:debezium-server-iceberg:pom:${revision} was not found in https://maven.pkg.github.com/memiiso/debezium-server-iceberg during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of github has elapsed or updates are forced
[ERROR] 
[ERROR] -> [Help 1]

Using the flatten plugin should allow us to properly depend on the github artifacts.

• https://maven.apache.org/guides/mini/guide-maven-ci-friendly.html#install-deploy

[ismailsimsek]

Thank you @matthewmcnew, merged