Add missing `maven-scm-plugin` version
<!-- Do not update the pdf plugin version without verifying the new version works by running mvn site -->
<maven-pdf-plugin.version>1.2</maven-pdf-plugin.version>
<maven-pmd-plugin.version>3.16.0</maven-pmd-plugin.version>
+ <maven-scm-plugin.version>1.12.2</maven-scm-plugin.version>
<maven-source-plugin.version>3.2.1</maven-source-plugin.version>
<maven-taglib-plugin.version>2.4</maven-taglib-plugin.version>
<maven-toolchains-plugin.version>3.1.0</maven-toolchains-plugin.version>
