build(deps): bump pdf-forms from 1.5.1 to 1.5.2

Bumps [pdf-forms](https://github.com/jkraemer/pdf-forms) from 1.5.1 to 1.5.2.
- [Release notes](https://github.com/jkraemer/pdf-forms/releases)
- [Changelog](https://github.com/jkraemer/pdf-forms/blob/master/History.txt)
- [Commits](jkraemer/pdf-forms@v1.5.1...1.5.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -365,7 +365,7 @@ GEM
     parser (3.3.7.1)
       ast (~> 2.4.1)
       racc
-    pdf-forms (1.5.1)
+    pdf-forms (1.5.2)
       cliver (~> 0.3.2)
       rexml (~> 3.2, >= 3.2.6)
       safe_shell (>= 1.0.3, < 2.0)