Upgrade to Selenium HtmlUnit 2.55.0.

Author: jxblum

gradle/dependency-management.gradle

@@ -9,7 +9,7 @@ ext['logbackVersion'] = '1.2.3'
 ext['junitVersion'] = '4.13.2'
 ext['mockitoVersion'] = '4.4.0'
 ext['multithreadedtcVersion'] = '1.01'
-ext['seleniumHtmlUnitVersion'] = '2.50.0'
+ext['seleniumHtmlUnitVersion'] = '2.55.0'
 ext['slf4jVersion'] = '1.7.32'
 ext['springSecurityVersion'] = '5.6.1'
 ext['springShellVersion'] = '1.2.0.RELEASE'