build(deps): bump spock-bom from 2.2-groovy-4.0 to 2.3-groovy-4.0

Bumps spock-bom from 2.2-groovy-4.0 to 2.3-groovy-4.0.

---
updated-dependencies:
- dependency-name: org.spockframework:spock-bom
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

plc4j/utils/test-generator/pom.xml

@@ -84,7 +84,7 @@
       <dependency>
         <groupId>org.spockframework</groupId>
         <artifactId>spock-bom</artifactId>
-        <version>2.2-groovy-4.0</version>
+        <version>2.3-groovy-4.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>