build(deps): bump combine_pdf from 1.0.28 to 1.0.29 (#7361)

Bumps [combine_pdf](https://github.com/boazsegev/combine_pdf) from 1.0.28 to 1.0.29.
- [Release notes](https://github.com/boazsegev/combine_pdf/releases)
- [Changelog](https://github.com/boazsegev/combine_pdf/blob/master/CHANGELOG.md)
- [Commits](boazsegev/combine_pdf@v1.0.28...v1.0.29)

---
updated-dependencies:
- dependency-name: combine_pdf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -123,7 +123,7 @@ GEM
       xpath (~> 3.2)
     cgi (0.4.1)
     chunky_png (1.4.0)
-    combine_pdf (1.0.28)
+    combine_pdf (1.0.29)
       matrix
       ruby-rc4 (>= 0.1.5)
     concurrent-ruby (1.3.4)