This change passes in a list of file types to the line counting
analysis. These are the languages for the databases being analyzed.
Line count analysis is restricted to these files.
To save time downloading the CodeQL bundle we're pre-downloading it into the
hosted Actions runner, but because the release schedule is different there may
be some version drift. This change allows a different version of the bundle
to be used than the default if a version isn't explicitly specified, there's
only one version downloaded, and it's been marked as a 'pinned-version' -
otherwise it reverts to the prior behavior.
