Bump rubyXL from 3.4.27 to 3.4.31 (#501)

Bumps [rubyXL](https://github.com/gilt/rubyXL) from 3.4.27 to 3.4.31.
- [Changelog](https://github.com/weshatheleopard/rubyXL/blob/master/CHANGELOG.md)
- [Commits](weshatheleopard/rubyXL@v3.4.27...v3.4.31)

---
updated-dependencies:
- dependency-name: rubyXL
  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

@@ -349,7 +349,7 @@ GEM
     ruby-vips (2.2.2)
       ffi (~> 1.12)
       logger
-    rubyXL (3.4.27)
+    rubyXL (3.4.31)
       nokogiri (>= 1.10.8)
       rubyzip (>= 1.3.0)
     rubyzip (2.3.2)