Update webmock requirement from = 3.16.2 to = 3.25.0

Updates the requirements on [webmock](https://github.com/bblimke/webmock) to permit the latest version.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.16.2...v3.25.0)

---
updated-dependencies:
- dependency-name: webmock
  dependency-type: direct:development
...

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

Author: dependabot[bot]

next_rails.gemspec

@@ -30,5 +30,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "timecop", "~> 0.9.1"
   spec.add_development_dependency "byebug"
   spec.add_development_dependency "rexml", "3.3.8" # limited on purpose, new versions don't work with old rubies
-  spec.add_development_dependency "webmock", "3.16.2" # limited on purpose, new versions don't work with old rubies
+  spec.add_development_dependency "webmock", "3.25.0" # limited on purpose, new versions don't work with old rubies
 end