MINOR: Bump org.apache.commons:commons-dbcp2 from 2.12.0 to 2.13.0 (#564)

Bumps org.apache.commons:commons-dbcp2 from 2.12.0 to 2.13.0.

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flight/flight-sql/pom.xml

@@ -95,7 +95,7 @@ under the License.
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-dbcp2</artifactId>
-      <version>2.12.0</version>
+      <version>2.13.0</version>
       <scope>test</scope>
       <exclusions>
         <exclusion>