Update dependency rspec-rails to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rspec-rails (changelog)	"~> 7.1" -> "~> 8.0"

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Release Notes

rspec/rspec-rails (rspec-rails)

v8.0.2

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Bug Fixes:

• Fix scaffold generator producing deprecated Rack http statuses.
  (Taketo Takashima, #​2860)

v8.0.1

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Bug Fixes:

• Fix scaffold generator producing deprecated Rack http statuses.
  (Taketo Takashima, #​2860)

v8.0.0

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Bug Fixes:

• Make the have_been_performed / have_been_enqueued return false for
  supports_block_expectations? as they don't supporting block expectations.
  (Sam Kidman, #​2851)

v7.1.1

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Enhancements:

• Add Rails 8 authentication generator support. (Jerome Dalbert, #​2811)
• Improve install generator comment for ActiveRecord::Migration.maintain_test_schema!
  (#​2832)
• Add support for served_by in system specs. (Sam Giffney, #​2841)

Breaking Changes:

• Minimum supported Rails version is 7.2.0

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