version 2.7.0 breaks with webpacker

[rioug]

Issue description

When trying to generate a PDF with wicked_pdf 2.7.0 it breaks with the following error :

 ActionView::Template::Error:
       uninitialized constant Webpacker::VERSION
     
                 Webpacker::VERSION

The issue was introduced in this PR #1067

Expected or desired behavior

It should generate a pdf without any error :)

System specifications

wicked_pdf gem version (output of cat Gemfile.lock | grep wicked_pdf): 2.7.0

webpacker version: 5.4.4 ( I don't think it has anything to do with the webpacker version but who knows ? )

wkhtmltopdf version (output of wkhtmltopdf --version): wkhtmltopdf 0.12.6 (with patched qt)

whtmltopdf provider gem and version if one is used: wkhtmltopdf-binary (0.12.6.6)

platform/distribution and version (e.g. Windows 10 / Ubuntu 16.04 / Heroku cedar): Ubuntu 22.04.3