deps: update dependency org.slf4j:log4j-over-slf4j to v2.0.12

Author: renovate-bot

bigtable-hbase-1.x-parent/bigtable-hbase-1.x-integration-tests/pom.xml

@@ -610,7 +610,7 @@ limitations under the License.
           <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
-            <version>1.7.36</version>
+            <version>2.0.12</version>
           </dependency>
         </dependencies>
       </plugin>

bigtable-hbase-2.x-parent/bigtable-hbase-2.x-integration-tests/pom.xml

@@ -353,7 +353,7 @@ limitations under the License.
           <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
-            <version>2.0.9</version>
+            <version>2.0.12</version>
           </dependency>
           <!-- TODO: Figure out why this is necessary -->
           <!-- minicluster has a hard undeclared dependency on junit? -->