Fixup ruby warnings

[ojab]

…/json/add/regexp.rb:17: warning: method redefined; discarding old as_json
…/activesupport-7.0.2.3/lib/active_support/core_ext/object/json.rb:134: warning: previous definition of as_json was here
…/consumer_contract/interaction_v2_parser.rb:41: warning: assigned but unused variable - request
…/matching_rules/merge.rb:45: warning: assigned but unused variable - recursed
…/consumer_contract/pact_file.rb:39: warning: assigned but unused variable - e
…/consumer_contract/pact_file.rb:61: warning: mismatched indentations at 'end' with 'if' at 58

[ojab]

First-time contributors need a maintainer to approve running workflows.

bundle exec rspec is green locally, sending to review.

[bethesque]

Thank you!