Fix maven central deployment

[kaklakariada]

Currently the automatic deployment tries to upload both variants for Scala 2.12 and 2.13 to the same artifact https://repo1.maven.org/maven2/com/exasol/import-export-udf-common-scala/ which causes the build to fail.

Instead they must be uploaded to

• https://repo1.maven.org/maven2/com/exasol/import-export-udf-common-scala_2.12/
• https://repo1.maven.org/maven2/com/exasol/import-export-udf-common-scala_2.13/

See the spark-connector for possible solution:

• https://github.com/exasol/spark-connector/blob/main/.github/workflows/release_droid_release_on_maven_central.yml
• https://github.com/exasol/spark-connector/blob/main/tools/createReleasePom.sh