chore(deps): update dependency database_cleaner to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
database_cleaner (changelog)	"~>1.8", ">= 1.8.1" → "~>2.0", ">= 2.1.0"

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Release Notes

DatabaseCleaner/database_cleaner (database_cleaner)

v2.1.0

Compare Source

v2.0.2

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v2.0.1

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v2.0.0

Compare Source

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[YOU54F]

Database not being cleaned, leading to errors in tests

       Sequel::NotNullConstraintViolation:
         SQLite3::ConstraintException: NOT NULL constraint failed: versions.pacticipant_id
       # ./lib/sequel/plugins/upsert.rb:76:in `manual_upsert'
       # ./lib/sequel/plugins/upsert.rb:25:in `upsert'
       # ./lib/pact_broker/versions/repository.rb:84:in `create'
       # ./lib/pact_broker/test/test_data_builder.rb:659:in `create_pacticipant_version'
       # ./lib/pact_broker/test/test_data_builder.rb:220:in `create_consumer_version'
       # ./spec/lib/pact_broker/domain/tag_spec.rb:60:in `block (3 levels) in <module:Domain>'
       # ------------------
       # --- Caused by: ---
       # SQLite3::ConstraintException:
       #   NOT NULL constraint failed: versions.pacticipant_id
       #   ./lib/sequel/plugins/upsert.rb:76:in `manual_upsert'