Use slf4j bom (#190)

* Use slf4j-bom in dependencyManagement
* Use version property naming convention from parent pom

pom.xml

@@ -49,18 +49,27 @@ SPDX-License-Identifier: EPL-2.0
     <maven.compiler.release>11</maven.compiler.release>
     <!-- rat plugin is no good at validating EPL headers out of the box -->
     <rat.skip>true</rat.skip>
-    <slf4j.version>2.0.13</slf4j.version>
+    <version.slf4j>2.0.13</version.slf4j>
   </properties>
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-bom</artifactId>
+        <version>${version.slf4j}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
   <dependencies>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>${slf4j.version}</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-simple</artifactId>
-      <version>${slf4j.version}</version>
       <scope>test</scope>
     </dependency>
   </dependencies>