Fix: Constructor with 1 argument that is not explicit

Created by: danesss

Issue

Jenkins builds started to fail cppcheck ever since https://github.com/ess-dmsc/kafka-to-nexus/pull/679

Build example: https://jenkins.esss.dk/dm/blue/organizations/jenkins/ess-dmsc%2Fkafka-to-nexus/detail/main/108/pipeline/172

It may be related to cppcheck errors like below (note that Jenkins is NOT showing these errors, but simply fails the build)

<?xml version="1.0" encoding="UTF-8"?>
<results version="2">
    <cppcheck version="2.7"/>
    <errors>
        <error id="noExplicitConstructor" severity="style" msg="Class &apos;StatusService&apos; has a constructor with 1 argument that is not explicit." verbose="Class &apos;StatusService&apos; has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided." cwe="398" file0="src/kafka-to-nexus.cpp">
            <location file="src/Status/StatusService.h" line="32" column="3"/>
            <symbol>StatusService</symbol>
        </error>
    </errors>
</results>

Description of work

Set constructor as explicit as no implicit conversions are desired here.

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