fix: put back version for bom in release (#2864)

Signed-off-by: Attila Mészáros <a_meszaros@apple.com>

Author: csviri

operator-framework-bom/pom.xml

@@ -131,6 +131,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>
+            <version>${maven-source-plugin.version}</version>
             <executions>
               <execution>
                 <id>attach-sources</id>
@@ -143,6 +144,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
+            <version>${maven-gpg-plugin.version}</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>