Update dependency rspec-rails to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rspec-rails (changelog)	"~> 7.0" → "~> 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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Full Changelog

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)

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