[povilasjurcys]

Bumps the version to 3.1.1 and moves the unreleased changelog entries under the new release:

• Changed: do not throw "Cannot return null for non-nullable" error when errors are manually rendered
• Added: allow to specify type error hooks in router
• Added: response.context in RSpec controller helpers
• Added: dig on the RSpec controller helpers test context, as on GraphQL::Query::Context

Also updates Gemfile.lock to the new version.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.17%. Comparing base (713ccdc) to head (0d000fa).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #318   +/-   ##
=======================================
  Coverage   98.17%   98.17%           
=======================================
  Files          68       68           
  Lines        1922     1922           
=======================================
  Hits         1887     1887           
  Misses         35       35           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.