fix(deps): update entur.helpers.version from v5.4 to v5.6 (#454)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -26,7 +26,7 @@
         <java.version>21</java.version>
         <entur.google.pubsub.emulator.download.skip>false</entur.google.pubsub.emulator.download.skip>
         <camel.version>4.8.6</camel.version>
-        <entur.helpers.version>5.4</entur.helpers.version>
+        <entur.helpers.version>5.6</entur.helpers.version>
         <commons-io.version>2.11.0</commons-io.version>
         <netex-gtfs-converter-java.version>2.1.73</netex-gtfs-converter-java.version>
         <zt-zip.version>1.17</zt-zip.version>