Bump wkhtmltopdf-binary from 0.12.6.2 to 0.12.6.3 (#381)

Bumps [wkhtmltopdf-binary](https://github.com/zakird/wkhtmltopdf_binary_gem) from 0.12.6.2 to 0.12.6.3.
- [Release notes](https://github.com/zakird/wkhtmltopdf_binary_gem/releases)
- [Changelog](https://github.com/zakird/wkhtmltopdf_binary_gem/blob/master/CHANGELOG)
- [Commits](https://github.com/zakird/wkhtmltopdf_binary_gem/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -418,7 +418,7 @@ GEM
     websocket-extensions (0.1.5)
     wicked_pdf (2.1.0)
       activesupport
-    wkhtmltopdf-binary (0.12.6.2)
+    wkhtmltopdf-binary (0.12.6.3)
     xpath (3.2.0)
       nokogiri (~> 1.8)
     zeitwerk (2.4.0)