Bump commons-parent from 50 to 51 (#50)

Bumps commons-parent from 50 to 51.

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/pom.xml b/pom.xml
index 5c09e7a..11bec78 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
   <parent>

     <groupId>org.apache.commons</groupId>

     <artifactId>commons-parent</artifactId>

-    <version>50</version>

+    <version>51</version>

   </parent>

   <modelVersion>4.0.0</modelVersion>

   <artifactId>commons-configuration2</artifactId>