Bump useragent to 2.3.0 to pull in ua-parser/uap-core#263 in which Headless Chrome version detected to be 0.0.0.
Update tests to reflect latest useragent OS major version string identifiers.

Per ua-parser/uap-core#286 , useragent purposely sets the Windows Vista family to Windows and major version to Vista. The change to useragent was intentional, and the maintainer advises upstream consumers to update tests to reflect the change.

Per 3rd-Eden/useragent#120 , there is an open question to change the stringified OS to not include 0 for missing version numbers. For example:

family: 'Windows'
major: 'Vista'
minor:
patch:
patch_minor:

would display as "Windows Vista" instead of "Windows Vista.0.0".

That open question not withstanding, this commit is an incremental improvement: You can now see both Chrome Headless version and Windows version information in your console output. In general, useragent consumers that perform int() conversions on 'major' should be aware.

Fixes #2762