Add Ubuntu 22.04 to the list of FIPS certified OS

Author: mpurg

linux_os/guide/system/software/integrity/certified-vendor/installed_OS_is_FIPS_certified/oval/shared.xml

@@ -16,6 +16,7 @@
       <extend_definition comment="Installed OS is Ubuntu 16.04" definition_ref="installed_OS_is_ubuntu1604" />
       <extend_definition comment="Installed OS is Ubuntu 18.04" definition_ref="installed_OS_is_ubuntu1804" />
       <extend_definition comment="Installed OS is Ubuntu 20.04" definition_ref="installed_OS_is_ubuntu2004" />
+      <extend_definition comment="Installed OS is Ubuntu 22.04" definition_ref="installed_OS_is_ubuntu2204" />
       <!-- DO NOT add operating systems here unless they adhere to government certifications
            and the vendor provides professional security updates and support -->
     </criteria>