Update yard requirement from = 0.9.26 to = 0.9.28

Updates the requirements on [yard](https://github.com/lsegal/yard) to permit the latest version.
- [Release notes](https://github.com/lsegal/yard/releases)
- [Changelog](https://github.com/lsegal/yard/blob/main/CHANGELOG.md)
- [Commits](lsegal/yard@v0.9.26...v0.9.28)

---
updated-dependencies:
- dependency-name: yard
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -48,7 +48,9 @@ GEM
       power_assert
     timecop (0.9.4)
     unicode-display_width (2.0.0)
-    yard (0.9.26)
+    webrick (1.7.0)
+    yard (0.9.28)
+      webrick (~> 1.7.0)
 
 PLATFORMS
   ruby
@@ -62,7 +64,7 @@ DEPENDENCIES
   simplecov (= 0.17.1, < 0.18)
   test-unit (= 3.4.4)
   timecop (= 0.9.4)
-  yard (= 0.9.26)
+  yard (= 0.9.28)
 
 BUNDLED WITH
    2.1.4

faker.gemspec

@@ -39,5 +39,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('simplecov', '0.17.1', '< 0.18')
   spec.add_development_dependency('test-unit', '3.4.4')
   spec.add_development_dependency('timecop', '0.9.4')
-  spec.add_development_dependency('yard', '0.9.26')
+  spec.add_development_dependency('yard', '0.9.28')
 end