Fix/Clean SPI module builds

In the CI logs, when building the SPI module, you can find these warnings:

Warning:  Some problems were encountered while building the effective model for io.gdcc:dataverse-spi:jar:2.0.0
Warning:  'version' contains an expression but should be a constant. @ io.gdcc:dataverse-spi:2.0.0${project.version.suffix}, /home/runner/work/dataverse/dataverse/modules/dataverse-spi/pom.xml, line 16, column 14
Warning:  'build.plugins.plugin.version' for org.apache.maven.plugins:maven-deploy-plugin is missing. @ io.gdcc:dataverse-spi:2.0.0${project.version.suffix}, /home/runner/work/dataverse/dataverse/modules/dataverse-spi/pom.xml, line 158, column 21
Warning:  
Warning:  It is highly recommended to fix these problems because they threaten the stability of your build.
Warning:  
Warning:  For this reason, future Maven versions might no longer support building such malformed projects.

We should address those to ensure nothing breaks.

The first one should be fixed by using sth. like mvn version:set -DnewVersion=.... Probably needs a little scripting.

The second one simply requires adding the plugin to <build><pluginManagement> in dataverse-parent.