Support for newer JEP-229 format

[timja]

See jenkinsci/incrementals-tools#24 (comment)

fyi @jglick

Noticed in jenkinsci/bom#859

[jglick]

plugin-compat-tester/plugins-compat-tester/src/main/java/org/jenkins/tools/test/PluginCompatTester.java

Lines 126 to 127 in 5a86f00

	/** First version with new parent POM. */
	public static final String JENKINS_CORE_FILE_REGEX = "WEB-INF/lib/jenkins-core-([0-9.]+(?:-[0-9a-f.]+)*(?:-(?i)([a-z]+)(-)?([0-9a-f.]+)?)?(?:-(?i)([a-z]+)(-)?([0-9a-f.]+)?)?(?:-SNAPSHOT)?)[.]jar";

needs to be adjusted as well in order for recent core incrementals to work with PCT