🐛 Fix junit output for vuln report

[czunker]

I tried it with the container image ubuntu:noble-20240114. Then the unit output currently get's this new section:

	<testsuite name="Vulnerability Report for ubuntu:noble-20240114@9069f132fbe5" tests="2" failures="2" errors="0" id="0" time="">
		<properties>
			<property name="report.packages.total" value="90"></property>
			<property name="report.packages.critical" value="0"></property>
			<property name="report.packages.high" value="2"></property>
			<property name="report.packages.medium" value="0"></property>
			<property name="report.packages.low" value="0"></property>
			<property name="report.packages.none" value="0"></property>
		</properties>
		<testcase name="libssl3" classname="vulnerability">
			<failure message="Update libssl3"><![CDATA[libssl3 with version3.0.10-1ubuntu3 has known vulnerabilities (score 7.5)]]></failure>
		</testcase>
		<testcase name="libc6" classname="vulnerability">
			<failure message="Update libc6 to 2.39-0ubuntu8.3"><![CDATA[libc6 with version2.38-3ubuntu1 has known vulnerabilities (score 7.3)]]></failure>
		</testcase>
	</testsuite>

[github-actions]

Test Results

  1 files   27 suites   1m 0s ⏱️
509 tests 508 ✅ 1 💤 0 ❌
510 runs  509 ✅ 1 💤 0 ❌

Results for commit 7ad8ecc.